/*
 * jquery.layout 1.3.0 - Release Candidate 26
 *
 * Copyright (c) 2010 
 *   Fabrizio Balliano (http://www.fabrizioballiano.net)
 *   Kevin Dalman (http://allpro.net)
 *
 * Dual licensed under the GPL (http://www.gnu.org/licenses/gpl.html)
 * and MIT (http://www.opensource.org/licenses/mit-license.php) licenses.
 *
 * Docs: http://layout.jquery-dev.net/documentation.html
 * Tips: http://layout.jquery-dev.net/tips.html
 * Help: http://groups.google.com/group/jquery-ui-layout
 *
 * $Date: 2010-02-27 18:00:00 -1800 (Sat, 27 Feb 2010) $
 * $Rev: 3026 $
 * 
 * NOTE: For best code readability, view this with a fixed-width font and tabs equal to 4-chars
 */
;(function ($) {
 
$.fn.layout = function (opts) {
 
/*
 * ###########################
 *   WIDGET CONFIG & OPTIONS
 * ###########################
 */
 
    // LANGUAGE CUSTOMIZATION - will be *externally customizable* in next version
    var lang = {
        Pane:        "Pane"
    ,    Open:        "Open"    // eg: "Open Pane"
    ,    Close:        "Close"
    ,    Resize:        "Resize"
    ,    Slide:        "Slide Open"
    ,    Pin:        "Pin"
    ,    Unpin:        "Un-Pin"
    ,    selector:    "selector"
    ,    msgNoRoom:    "Not enough room to show this pane."
    ,    errContainerMissing:    "UI Layout Initialization Error\n\nThe specified layout-container does not exist."
    ,    errCenterPaneMissing:    "UI Layout Initialization Error\n\nThe center-pane element does not exist.\n\nThe center-pane is a required element."
    ,    errContainerHeight:        "UI Layout Initialization Warning\n\nThe layout-container \"CONTAINER\" has no height.\n\nTherefore the layout is 0-height and hence 'invisible'!"
    ,    errButton:                "Error Adding Button \n\nInvalid "
    };
 
    // DEFAULT OPTIONS - CHANGE IF DESIRED
    var options = {
        name:                        ""            // Not required, but useful for buttons and used for the state-cookie
    ,    scrollToBookmarkOnLoad:        true        // after creating a layout, scroll to bookmark in URL (.../page.htm#myBookmark)
    ,    resizeWithWindow:            true        // bind thisLayout.resizeAll() to the window.resize event
    ,    resizeWithWindowDelay:        200            // delay calling resizeAll because makes window resizing very jerky
    ,    resizeWithWindowMaxDelay:    0            // 0 = none - force resize every XX ms while window is being resized
    ,    onresizeall_start:            null        // CALLBACK when resizeAll() STARTS    - NOT pane-specific
    ,    onresizeall_end:            null        // CALLBACK when resizeAll() ENDS    - NOT pane-specific
    ,    onload:                        null        // CALLBACK when Layout inits - after options initialized, but before elements
    ,    onunload:                    null        // CALLBACK when Layout is destroyed OR onWindowUnload
    ,    autoBindCustomButtons:        false        // search for buttons with ui-layout-button class and auto-bind them
    ,    zIndex:                        null        // the PANE zIndex - resizers and masks will be +1
    //    PANE SETTINGS
    ,    defaults: { // default options for 'all panes' - will be overridden by 'per-pane settings'
            applyDemoStyles:         false        // NOTE: renamed from applyDefaultStyles for clarity
        ,    closable:                true        // pane can open & close
        ,    resizable:                true        // when open, pane can be resized 
        ,    slidable:                true        // when closed, pane can 'slide open' over other panes - closes on mouse-out
        ,    initClosed:                false        // true = init pane as 'closed'
        ,    initHidden:             false         // true = init pane as 'hidden' - no resizer-bar/spacing
        //    SELECTORS
        //,    paneSelector:            ""            // MUST be pane-specific - jQuery selector for pane
        ,    contentSelector:        ".ui-layout-content" // INNER div/element to auto-size so only it scrolls, not the entire pane!
        //    GENERIC ROOT-CLASSES - for auto-generated classNames
        ,    paneClass:                "ui-layout-pane"    // border-Pane - default: 'ui-layout-pane'
        ,    resizerClass:            "ui-layout-resizer"    // Resizer Bar        - default: 'ui-layout-resizer'
        ,    togglerClass:            "ui-layout-toggler"    // Toggler Button    - default: 'ui-layout-toggler'
        ,    buttonClass:            "ui-layout-button"    // CUSTOM Buttons    - default: 'ui-layout-button-toggle/-open/-close/-pin'
        //    ELEMENT SIZE & SPACING
        //,    size:                    100            // MUST be pane-specific -initial size of pane
        ,    minSize:                0            // when manually resizing a pane
        ,    maxSize:                0            // ditto, 0 = no limit
        ,    spacing_open:            6            // space between pane and adjacent panes - when pane is 'open'
        ,    spacing_closed:            6            // ditto - when pane is 'closed'
        ,    togglerLength_open:        50            // Length = WIDTH of toggler button on north/south sides - HEIGHT on east/west sides
        ,    togglerLength_closed:     50            // 100% OR -1 means 'full height/width of resizer bar' - 0 means 'hidden'
        ,    togglerAlign_open:        "center"    // top/left, bottom/right, center, OR...
        ,    togglerAlign_closed:    "center"    // 1 => nn = offset from top/left, -1 => -nn == offset from bottom/right
        ,    togglerTip_open:        lang.Close    // Toggler tool-tip (title)
        ,    togglerTip_closed:        lang.Open    // ditto
        //    RESIZING OPTIONS
        ,    resizerDblClickToggle:    true        // 
        ,    noSelectionWhileDragging: true        // set $(document).disableSelection to avoid selecting text while dragging the resizer
        ,    autoResize:                true        // IF size is 'auto' or a percentage, then recalc 'pixel size' whenever the layout resizes
        ,    autoReopen:                true        // IF a pane was auto-closed due to noRoom, reopen it when there is room? False = leave it closed
        ,    resizerDragOpacity:        1            // option for ui.draggable
        //,    resizerCursor:            ""            // MUST be pane-specific - cursor when over resizer-bar
        ,    maskIframesOnResize:    true        // true = all iframes OR = iframe-selector(s) - adds masking-div during resizing/dragging
        ,    resizeWhileDragging:    false        // true = LIVE Resizing as resizer is dragged
        ,    resizeContentWhileDragging:    false    // true = re-measure header/footer heights as resizer is dragged
        //    TIPS & MESSAGES - also see lang object
        ,    noRoomToOpenTip:        lang.msgNoRoom
        ,    resizerTip:                lang.Resize    // Resizer tool-tip (title)
        ,    sliderTip:                lang.Slide // resizer-bar triggers 'sliding' when pane is closed
        ,    sliderCursor:            "pointer"    // cursor when resizer-bar will trigger 'sliding'
        ,    slideTrigger_open:        "click"        // click, dblclick, mouseover
        ,    slideTrigger_close:        "mouseout"    // click, mouseout
        ,    hideTogglerOnSlide:        false        // when pane is slid-open, should the toggler show?
        ,    togglerContent_open:    ""            // text or HTML to put INSIDE the toggler
        ,    togglerContent_closed:    ""            // ditto
        //    HOT-KEYS & MISC
        ,    showOverflowOnHover:    false        // will bind allowOverflow() utility to pane.onMouseOver
        ,    trackMouseWhenSliding:    false        // true = check isMouseOver to avoid premature slide-closed
        ,    enableCursorHotkey:        true        // enabled 'cursor' hotkeys
        //,    customHotkey:            ""            // MUST be pane-specific - EITHER a charCode OR a character
        ,    customHotkeyModifier:    "SHIFT"        // either 'SHIFT', 'CTRL' or 'CTRL+SHIFT' - NOT 'ALT'
        //    PANE ANIMATION
        //    NOTE: fxSss_open & fxSss_close options (eg: fxName_open) are auto-generated if not passed
        ,    fxName:                    "slide"     // ('none' or blank), slide, drop, scale
        ,    fxSpeed:                null        // slow, normal, fast, 200, nnn - if passed, will OVERRIDE fxSettings.duration
        ,    fxSettings:                {}            // can be passed, eg: { easing: "easeOutBounce", duration: 1500 }
        ,    fxOpacityFix:            true        // tries to fix opacity in IE to restore anti-aliasing after animation
        //    CALLBACKS
        ,    triggerEventsOnLoad:    false        // true = trigger onopen OR onclose callbacks when layout initializes
        ,    triggerEventsWhileDragging: true    // true = trigger onresize callback REPEATEDLY if resizeWhileDragging==true
        ,    onshow_start:            null        // CALLBACK when pane STARTS to Show    - BEFORE onopen/onhide_start
        ,    onshow_end:                null        // CALLBACK when pane ENDS being Shown    - AFTER  onopen/onhide_end
        ,    onhide_start:            null        // CALLBACK when pane STARTS to Close    - BEFORE onclose_start
        ,    onhide_end:                null        // CALLBACK when pane ENDS being Closed    - AFTER  onclose_end
        ,    onopen_start:            null        // CALLBACK when pane STARTS to Open
        ,    onopen_end:                null        // CALLBACK when pane ENDS being Opened
        ,    onclose_start:            null        // CALLBACK when pane STARTS to Close
        ,    onclose_end:            null        // CALLBACK when pane ENDS being Closed
        ,    onresize_start:            null        // CALLBACK when pane STARTS to be ***MANUALLY*** Resized
        ,    onresize_end:            null        // CALLBACK when pane ENDS being Resized ***FOR ANY REASON***
        }
    ,    north: {
            paneSelector:            ".ui-layout-north"
        ,    size:                    "auto"        // eg: "auto", "30%", 200
        ,    resizerCursor:            "n-resize"    // custom = url(myCursor.cur)
        ,    customHotkey:            ""            // EITHER a charCode OR a character
        }
    ,    south: {
            paneSelector:            ".ui-layout-south"
        ,    size:                    "auto"
        ,    resizerCursor:            "s-resize"
        ,    customHotkey:            ""
        }
    ,    east: {
            paneSelector:            ".ui-layout-east"
        ,    size:                    200
        ,    resizerCursor:            "e-resize"
        ,    customHotkey:            ""
        }
    ,    west: {
            paneSelector:            ".ui-layout-west"
        ,    size:                    200
        ,    resizerCursor:            "w-resize"
        ,    customHotkey:            ""
        }
    ,    center: {
            paneSelector:            ".ui-layout-center"
        ,    minWidth:                0
        ,    minHeight:                0
        }
 
    //    STATE MANAGMENT
    ,    useStateCookie:                false        // Enable cookie-based state-management - can fine-tune with cookie.autoLoad/autoSave
    ,    cookie: {
            name:                    ""            // If not specified, will use Layout.name, else just "Layout"
        ,    autoSave:                true        // Save a state cookie when page exits?
        ,    autoLoad:                true        // Load the state cookie when Layout inits?
        //    Cookie Options
        ,    domain:                    ""
        ,    path:                    ""
        ,    expires:                ""            // 'days' to keep cookie - leave blank for 'session cookie'
        ,    secure:                    false
        //    List of options to save in the cookie - must be pane-specific
        ,    keys:                    "north.size,south.size,east.size,west.size,"+
                                    "north.isClosed,south.isClosed,east.isClosed,west.isClosed,"+
                                    "north.isHidden,south.isHidden,east.isHidden,west.isHidden"
        }
    };
 
 
    // PREDEFINED EFFECTS / DEFAULTS
    var effects = { // LIST *PREDEFINED EFFECTS* HERE, even if effect has no settings
        slide:    {
            all:    { duration:  "fast"    } // eg: duration: 1000, easing: "easeOutBounce"
        ,    north:    { direction: "up"    }
        ,    south:    { direction: "down"    }
        ,    east:    { direction: "right"}
        ,    west:    { direction: "left"    }
        }
    ,    drop:    {
            all:    { duration:  "slow"    } // eg: duration: 1000, easing: "easeOutQuint"
        ,    north:    { direction: "up"    }
        ,    south:    { direction: "down"    }
        ,    east:    { direction: "right"}
        ,    west:    { direction: "left"    }
        }
    ,    scale:    {
            all:    { duration:  "fast"    }
        }
    };
 
 
    // DYNAMIC DATA - IS READ-ONLY EXTERNALLY!
    var state = {
        // generate unique ID to use for event.namespace so can unbind only events added by 'this layout'
        id:            "layout"+ new Date().getTime()    // code uses alias: sID
    ,    initialized: false
    ,    container:    {} // init all keys
    ,    north:        {}
    ,    south:        {}
    ,    east:        {}
    ,    west:        {}
    ,    center:        {}
    ,    cookie:        {} // State Managment data storage
    };
 
 
    // INTERNAL CONFIG DATA - DO NOT CHANGE THIS!
    var _c = {
        allPanes:        "north,south,west,east,center"
    ,    borderPanes:    "north,south,west,east"
    ,    altSide: {
            north:    "south"
        ,    south:    "north"
        ,    east:     "west"
        ,    west:     "east"
        }
    //    CSS used in multiple places
    ,    hidden:  { visibility: "hidden" }
    ,    visible: { visibility: "visible" }
    //    layout element settings
    ,    zIndex: { // set z-index values here
            pane_normal:    1        // normal z-index for panes
        ,    resizer_normal:    2        // normal z-index for resizer-bars
        ,    iframe_mask:    2        // overlay div used to mask pane(s) during resizing
        ,    pane_sliding:    100        // applied to *BOTH* the pane and its resizer when a pane is 'slid open'
        ,    pane_animate:    1000    // applied to the pane when being animated - not applied to the resizer
        ,    resizer_drag:    10000    // applied to the CLONED resizer-bar when being 'dragged'
        }
    ,    resizers: {
            cssReq: {
                position:     "absolute"
            ,    padding:     0
            ,    margin:     0
            ,    fontSize:    "1px"
            ,    textAlign:    "left"    // to counter-act "center" alignment!
            ,    overflow:     "hidden" // prevent toggler-button from overflowing
            //    SEE c.zIndex.resizer_normal
            }
        ,    cssDemo: { // DEMO CSS - applied if: options.PANE.applyDemoStyles=true
                background: "#DDD"
            ,    border:        "none"
            }
        }
    ,    togglers: {
            cssReq: {
                position:     "absolute"
            ,    display:     "block"
            ,    padding:     0
            ,    margin:     0
            ,    overflow:    "hidden"
            ,    textAlign:    "center"
            ,    fontSize:    "1px"
            ,    cursor:     "pointer"
            ,    zIndex:     1
            }
        ,    cssDemo: { // DEMO CSS - applied if: options.PANE.applyDemoStyles=true
                background: "#AAA"
            }
        }
    ,    content: {
            cssReq: {
                position:    "relative" /* contain floated or positioned elements */
            }
        ,    cssDemo: { // DEMO CSS - applied if: options.PANE.applyDemoStyles=true
                overflow:    "auto"
            ,    padding:    "10px"
            }
        ,    cssDemoPane: { // DEMO CSS - REMOVE scrolling from 'pane' when it has a content-div
                overflow:    "hidden"
            ,    padding:    0
            }
        }
    ,    panes: { // defaults for ALL panes - overridden by 'per-pane settings' below
            cssReq: {
                position:     "absolute"
            ,    margin:        0
            //    SEE c.zIndex.pane_normal
            }
        ,    cssDemo: { // DEMO CSS - applied if: options.PANE.applyDemoStyles=true
                padding:    "10px"
            ,    background:    "#FFF"
            ,    border:        "1px solid #BBB"
            ,    overflow:    "auto"
            }
        }
    ,    north: {
            side:            "Top"
        ,    sizeType:        "Height"
        ,    dir:            "horz"
        ,    cssReq: {
                top:         0
            ,    bottom:     "auto"
            ,    left:         0
            ,    right:         0
            ,    width:         "auto"
            //    height:     DYNAMIC
            }
        ,    pins:            []    // array of 'pin buttons' to be auto-updated on open/close (classNames)
        }
    ,    south: {
            side:            "Bottom"
        ,    sizeType:        "Height"
        ,    dir:            "horz"
        ,    cssReq: {
                top:         "auto"
            ,    bottom:     0
            ,    left:         0
            ,    right:         0
            ,    width:         "auto"
            //    height:     DYNAMIC
            }
        ,    pins:            []
        }
    ,    east: {
            side:            "Right"
        ,    sizeType:        "Width"
        ,    dir:            "vert"
        ,    cssReq: {
                left:         "auto"
            ,    right:         0
            ,    top:         "auto" // DYNAMIC
            ,    bottom:     "auto" // DYNAMIC
            ,    height:     "auto"
            //    width:         DYNAMIC
            }
        ,    pins:            []
        }
    ,    west: {
            side:            "Left"
        ,    sizeType:        "Width"
        ,    dir:            "vert"
        ,    cssReq: {
                left:         0
            ,    right:         "auto"
            ,    top:         "auto" // DYNAMIC
            ,    bottom:     "auto" // DYNAMIC
            ,    height:     "auto"
            //    width:         DYNAMIC
            }
        ,    pins:            []
        }
    ,    center: {
            dir:            "center"
        ,    cssReq: {
                left:         "auto" // DYNAMIC
            ,    right:         "auto" // DYNAMIC
            ,    top:         "auto" // DYNAMIC
            ,    bottom:     "auto" // DYNAMIC
            ,    height:     "auto"
            ,    width:         "auto"
            }
        }
    //    internal tracking
    ,    timers: {}
    };
 
 
/*
 * ###########################
 *  INTERNAL HELPER FUNCTIONS
 * ###########################
 */
 
    /**
     * min / max
     *
     * Aliases for Math methods to simplify coding
     */
    var min = function (x,y) { return Math.min(x,y); };
    var max = function (x,y) { return Math.max(x,y); };
 
    /**
     * _transformData
     *
     * Processes the options passed in and transforms them into the format used by layout()
     * Missing keys are added, and converts the data if passed in 'flat-format' (no sub-keys)
     * In flat-format, pane-specific-settings are prefixed like: north__optName  (2-underscores)
     * To update effects, options MUST use nested-keys format, with an effects key ???
     *
     * @callers    initOptions()
     * @params  JSON    d    Data/options passed by user - may be a single level or nested levels
     * @returns JSON        Creates a data struture that perfectly matches 'options', ready to be imported
     */
    var _transformData = function (d) {
        var json = { cookie:{}, defaults:{fxSettings:{}}, north:{fxSettings:{}}, south:{fxSettings:{}}, east:{fxSettings:{}}, west:{fxSettings:{}}, center:{fxSettings:{}} };
        d = d || {};
        if (d.effects || d.cookie || d.defaults || d.north || d.south || d.west || d.east || d.center)
            json = $.extend( true, json, d ); // already in json format - add to base keys
        else
            // convert 'flat' to 'nest-keys' format - also handles 'empty' user-options
            $.each( d, function (key,val) {
                a = key.split("__");
                if (!a[1] || json[a[0]]) // check for invalid keys
                    json[ a[1] ? a[0] : "defaults" ][ a[1] ? a[1] : a[0] ] = val;
            });
        return json;
    };
 
    /**
     * _queue
     *
     * Set an INTERNAL callback to avoid simultaneous animation
     * Runs only if needed and only if all callbacks are not 'already set'
     * Called by open() and close() when isLayoutBusy=true
     *
     * @param String   action  Either 'open' or 'close'
     * @param String   pane    A valid border-pane name, eg 'west'
     * @param Boolean  param   Extra param for callback (optional)
     */
    var _queue = function (action, pane, param) {
        var tried = [];
 
        // if isLayoutBusy, then some pane must be 'moving'
        $.each(_c.borderPanes.split(","), function (i, p) {
            if (_c[p].isMoving) {
                bindCallback(p); // TRY to bind a callback
                return false;    // BREAK
            }
        });
 
        // if pane does NOT have a callback, then add one, else follow the callback chain...
        function bindCallback (p) {
            var c = _c[p];
            if (!c.doCallback) {
                c.doCallback = true;
                c.callback = action +","+ pane +","+ (param ? 1 : 0);
            }
            else { // try to 'chain' this callback
                tried.push(p);
                var cbPane = c.callback.split(",")[1]; // 2nd param of callback is 'pane'
                // ensure callback target NOT 'itself' and NOT 'target pane' and NOT already tried (avoid loop)
                if (cbPane != p && cbPane != pane && !$.inArray(p, tried))
                    bindCallback(cbPane); // RECURSE
            }
        }
    };
 
    /**
     * _dequeue
     *
     * RUN the INTERNAL callback for this pane - if one exists
     *
     * @param String   action  Either 'open' or 'close'
     * @param String   pane    A valid border-pane name, eg 'west'
     * @param Boolean  param   Extra param for callback (optional)
     */
    var _dequeue = function (pane) {
        var c = _c[pane];
 
        // RESET flow-control flags
        _c.isLayoutBusy = false;
        delete c.isMoving;
        if (!c.doCallback || !c.callback) return;
 
        c.doCallback = false; // RESET logic flag
 
        // EXECUTE the callback
        var
            cb = c.callback.split(",")
        ,    param = (cb[2] > 0 ? true : false)
        ;
        if (cb[0] == "open")
            open( cb[1], param  );
        else if (cb[0] == "close")
            close( cb[1], param );
 
        if (!c.doCallback) c.callback = null; // RESET - unless callback above enabled it again!
    };
 
    /**
     * _execCallback
     *
     * Executes a Callback function after a trigger event, like resize, open or close
     *
     * @param String  pane   This is passed only so we can pass the 'pane object' to the callback
     * @param String  v_fn  Accepts a function name, OR a comma-delimited array: [0]=function name, [1]=argument
     */
    var _execCallback = function (pane, v_fn) {
        if (!v_fn) return;
        var fn;
        try {
            if (typeof v_fn == "function")
                fn = v_fn;    
            else if (typeof v_fn != "string")
                return;
            else if (v_fn.match(/,/)) {
                // function name cannot contain a comma, so must be a function name AND a 'name' parameter
                var
                    args = v_fn.split(",")
                ,    fn = eval(args[0])
                ;
                if (typeof fn=="function" && args.length > 1)
                    return fn(args[1]); // pass the argument parsed from 'list'
            }
            else // just the name of an external function?
                fn = eval(v_fn);
 
            if (typeof fn=="function") {
                if (pane && $Ps[pane])
                    // pass data: pane-name, pane-element, pane-state (copy), pane-options, and layout-name
                    return fn( pane, $Ps[pane], $.extend({},state[pane]), options[pane], options.name );
                else // must be a layout/container callback - pass suitable info
                    return fn( Instance, $.extend({},state), options, options.name );
            }
        }
        catch (ex) {}
    };
 
    /**
     * _showInvisibly
     *
     * Returns hash container 'display' and 'visibility'
     *
     * @TODO: SEE $.swap() - swaps CSS, runs callback, resets CSS
     */
    var _showInvisibly = function ($E, force) {
        if (!$E) return {};
        if (!$E.jquery) $E = $($E);
        var CSS = {
            display:    $E.css('display')
        ,    visibility:    $E.css('visibility')
        };
        if (force || CSS.display == "none") { // only if not *already hidden*
            $E.css({ display: "block", visibility: "hidden" }); // show element 'invisibly' so can be measured
            return CSS;
        }
        else return {};
    };
 
    /**
     * _fixIframe
     *
     * cure iframe display issues in IE & other browsers
     */
    var _fixIframe = function (pane) {
        if (state.browser.mozilla) return; // skip FireFox - it auto-refreshes iframes onShow
        var $P = $Ps[pane];
        // if the 'pane' is an iframe, do it
        if (state[pane].tagName == "IFRAME")
            $P.css(_c.hidden).css(_c.visible); 
        else // ditto for any iframes INSIDE the pane
            $P.find('IFRAME').css(_c.hidden).css(_c.visible);
    };
 
    /**
     * _cssNum
     *
     * Returns the 'current CSS numeric value' for an element - returns 0 if property does not exist
     *
     * @callers  Called by many methods
     * @param jQuery  $Elem  Must pass a jQuery object - first element is processed
     * @param String  property  The name of the CSS property, eg: top, width, etc.
     * @returns Variant  Usually is used to get an integer value for position (top, left) or size (height, width)
     */
    var _cssNum = function ($E, prop) {
        if (!$E.jquery) $E = $($E);
        var CSS = _showInvisibly($E);
        var val = parseInt($.curCSS($E[0], prop, true), 10) || 0;
        $E.css( CSS ); // RESET
        return val;
    };
 
    var _borderWidth = function (E, side) {
        if (E.jquery) E = E[0];
        var b = "border"+ side.substr(0,1).toUpperCase() + side.substr(1); // left => Left
        return $.curCSS(E, b+"Style", true) == "none" ? 0 : (parseInt($.curCSS(E, b+"Width", true), 10) || 0);
    };
 
    /**
     * cssW / cssH / cssSize / cssMinDims
     *
     * Contains logic to check boxModel & browser, and return the correct width/height for the current browser/doctype
     *
     * @callers  initPanes(), sizeMidPanes(), initHandles(), sizeHandles()
     * @param Variant  el  Can accept a 'pane' (east, west, etc) OR a DOM object OR a jQuery object
     * @param Integer  outerWidth/outerHeight  (optional) Can pass a width, allowing calculations BEFORE element is resized
     * @returns Integer  Returns the innerWidth/Height of the elem by subtracting padding and borders
     *
     * @TODO  May need additional logic for other browser/doctype variations? Maybe use more jQuery methods?
     */
    var cssW = function (el, outerWidth) {
        var
            str    = typeof el == "string"
        ,    $E    = str ? $Ps[el] : $(el)
        ;
        if (isNaN(outerWidth)) // not specified
            outerWidth = str ? getPaneSize(el) : $E.outerWidth();
 
        // a 'calculated' outerHeight can be passed so borders and/or padding are removed if needed
        if (outerWidth <= 0) return 0;
 
        if (!state.browser.boxModel) return outerWidth;
 
        // strip border and padding from outerWidth to get CSS Width
        var W = outerWidth
            - _borderWidth($E, "Left")
            - _borderWidth($E, "Right")
            - _cssNum($E, "paddingLeft")        
            - _cssNum($E, "paddingRight")
        ;
 
        return W > 0 ? W : 0;
    };
 
    var cssH = function (el, outerHeight) {
        var
            str    = typeof el == "string"
        ,    $E    = str ? $Ps[el] : $(el)
        ;
        if (isNaN(outerHeight)) // not specified
            outerHeight = str ? getPaneSize(el) : $E.outerHeight();
 
        // a 'calculated' outerHeight can be passed so borders and/or padding are removed if needed
        if (outerHeight <= 0) return 0;
 
        if (!state.browser.boxModel) return outerHeight;
 
        // strip border and padding from outerHeight to get CSS Height
        var H = outerHeight
            - _borderWidth($E, "Top")
            - _borderWidth($E, "Bottom")
            - _cssNum($E, "paddingTop")
            - _cssNum($E, "paddingBottom")
        ;
 
        return H > 0 ? H : 0;
    };
 
    var cssSize = function (pane, outerSize) {
        if (_c[pane].dir=="horz") // pane = north or south
            return cssH(pane, outerSize);
        else // pane = east or west
            return cssW(pane, outerSize);
    };
 
    var cssMinDims = function (pane) {
        // minWidth/Height means CSS width/height = 1px
        var
            dir = _c[pane].dir
        ,    d = {
                minWidth:    1001 - cssW(pane, 1000)
            ,    minHeight:    1001 - cssH(pane, 1000)
            }
        ;
        if (dir == "horz") d.minSize = d.minHeight;
        if (dir == "vert") d.minSize = d.minWidth;
        return d;
    };
 
    // TODO: see if these methods can be made more useful...
    // TODO: *maybe* return cssW/H from these so caller can use this info
 
    var setOuterWidth = function (el, outerWidth, autoHide) {
        var $E = el, w;
        if (typeof el == "string") $E = $Ps[el]; // west
        else if (!el.jquery) $E = $(el);
        w = cssW($E, outerWidth);
        $E.css({ width: w });
        if (w > 0) {
            if (autoHide && $E.data('autoHidden') && $E.innerHeight() > 0) {
                $E.show().data('autoHidden', false);
                if (!state.browser.mozilla) // FireFox refreshes iframes - IE doesn't
                    // make hidden, then visible to 'refresh' display after animation
                    $E.css(_c.hidden).css(_c.visible);
            }
        }
        else if (autoHide && !$E.data('autoHidden'))
            $E.hide().data('autoHidden', true);
    };
 
    var setOuterHeight = function (el, outerHeight, autoHide) {
        var $E = el;
        if (typeof el == "string") $E = $Ps[el]; // west
        else if (!el.jquery) $E = $(el);
        h = cssH($E, outerHeight);
        $E.css({ height: h, visibility: "visible" }); // may have been 'hidden' by sizeContent
        if (h > 0 && $E.innerWidth() > 0) {
            if (autoHide && $E.data('autoHidden')) {
                $E.show().data('autoHidden', false);
                if (!state.browser.mozilla) // FireFox refreshes iframes - IE doesn't
                    $E.css(_c.hidden).css(_c.visible);
            }
        }
        else if (autoHide && !$E.data('autoHidden'))
            $E.hide().data('autoHidden', true);
    };
 
    var setOuterSize = function (el, outerSize, autoHide) {
        if (_c[pane].dir=="horz") // pane = north or south
            setOuterHeight(el, outerSize, autoHide);
        else // pane = east or west
            setOuterWidth(el, outerSize, autoHide);
    };
 
 
    /**
     * _parseSize
     *
     * Converts any 'size' params to a pixel/integer size, if not already
     * If 'auto' or a decimal/percentage is passed as 'size', a pixel-size is calculated
     *
     * @returns Integer
     */
    var _parseSize = function (pane, size, dir) {
        if (!dir) dir = _c[pane].dir;
 
        if (typeof size=='string' && size.match(/%/))
            size = parseInt(size) / 100; // convert % to decimal
 
        if (size === 0)
            return 0;
        else if (size >= 1)
            return parseInt(size,10);
        else if (size > 0) { // percentage, eg: .25
            var o = options, avail;
            if (dir=="horz") // north or south or center.minHeight
                avail = sC.innerHeight - ($Ps.north ? o.north.spacing_open : 0) - ($Ps.south ? o.south.spacing_open : 0);
            else if (dir=="vert") // east or west or center.minWidth
                avail = sC.innerWidth - ($Ps.west ? o.west.spacing_open : 0) - ($Ps.east ? o.east.spacing_open : 0);
            return Math.floor(avail * size);
        }
        else if (pane=="center")
            return 0;
        else { // size < 0 || size=='auto' || size==Missing || size==Invalid
            // auto-size the pane
            var
                $P    = $Ps[pane]
            ,    dim    = (dir == "horz" ? "height" : "width")
            ,    vis    = _showInvisibly($P) // show pane invisibly if hidden
            ,    s    = $P.css(dim); // SAVE current size
            ;
            $P.css(dim, "auto");
            size = (dim == "height") ? $P.outerHeight() : $P.outerWidth(); // MEASURE
            $P.css(dim, s).css(vis); // RESET size & visibility
            return size;
        }
    };
 
    /**
     * getPaneSize
     *
     * Calculates current 'size' (outer-width or outer-height) of a border-pane - optionally with 'pane-spacing' added
     *
     * @returns Integer  Returns EITHER Width for east/west panes OR Height for north/south panes - adjusted for boxModel & browser
     */
    var getPaneSize = function (pane, inclSpace) {
        var 
            $P    = $Ps[pane]
        ,    o    = options[pane]
        ,    s    = state[pane]
        ,    oSp    = (inclSpace ? o.spacing_open : 0)
        ,    cSp    = (inclSpace ? o.spacing_closed : 0)
        ;
        if (!$P || s.isHidden)
            return 0;
        else if (s.isClosed || (s.isSliding && inclSpace))
            return cSp;
        else if (_c[pane].dir == "horz")
            return $P.outerHeight() + oSp;
        else // dir == "vert"
            return $P.outerWidth() + oSp;
    };
 
    /**
     * setSizeLimits
     *
     * Calculate min/max pane dimensions and limits for resizing
     */
    var setSizeLimits = function (pane, slide) {
        var 
            o                = options[pane]
        ,    s                = state[pane]
        ,    c                = _c[pane]
        ,    dir                = c.dir
        ,    side            = c.side.toLowerCase()
        ,    type            = c.sizeType.toLowerCase()
        ,    isSliding        = (slide != undefined ? slide : s.isSliding) // only open() passes 'slide' param
        ,    $P                = $Ps[pane]
        ,    paneSpacing        = o.spacing_open
        //    measure the pane on the *opposite side* from this pane
        ,    altPane            = _c.altSide[pane]
        ,    altS            = state[altPane]
        ,    $altP            = $Ps[altPane]
        ,    altPaneSize        = (!$altP || altS.isVisible===false || altS.isSliding ? 0 : (dir=="horz" ? $altP.outerHeight() : $altP.outerWidth()))
        ,    altPaneSpacing    = ((!$altP || altS.isHidden ? 0 : options[altPane][ altS.isClosed !== false ? "spacing_closed" : "spacing_open" ]) || 0)
        //    limitSize prevents this pane from 'overlapping' opposite pane
        ,    containerSize    = (dir=="horz" ? sC.innerHeight : sC.innerWidth)
        ,    minCenterDims    = cssMinDims("center")
        ,    minCenterSize    = dir=="horz" ? max(options.center.minHeight, minCenterDims.minHeight) : max(options.center.minWidth, minCenterDims.minWidth)
        //    if pane is 'sliding', then ignore center and alt-pane sizes - because 'overlays' them
        ,    limitSize        = (containerSize - paneSpacing - (isSliding ? 0 : (_parseSize("center", minCenterSize, dir) + altPaneSize + altPaneSpacing)))
        ,    minSize            = s.minSize = max( _parseSize(pane, o.minSize), cssMinDims(pane).minSize )
        ,    maxSize            = s.maxSize = min( (o.maxSize ? _parseSize(pane, o.maxSize) : 100000), limitSize )
        ,    r                = s.resizerPosition = {} // used to set resizing limits
        ,    top                = sC.insetTop
        ,    left            = sC.insetLeft
        ,    W                = sC.innerWidth
        ,    H                = sC.innerHeight
        ,    rW                = o.spacing_open // subtract resizer-width to get top/left position for south/east
        ;
        switch (pane) {
            case "north":    r.min = top + minSize;
                            r.max = top + maxSize;
                            break;
            case "west":    r.min = left + minSize;
                            r.max = left + maxSize;
                            break;
            case "south":    r.min = top + H - maxSize - rW;
                            r.max = top + H - minSize - rW;
                            break;
            case "east":    r.min = left + W - maxSize - rW;
                            r.max = left + W - minSize - rW;
                            break;
        };
    };
 
    /**
     * calcNewCenterPaneDims
     *
     * Returns data for setting the size/position of center pane. Also used to set Height for east/west panes
     *
     * @returns JSON  Returns a hash of all dimensions: top, bottom, left, right, (outer) width and (outer) height
     */
    var calcNewCenterPaneDims = function () {
        var d = {
            top:    getPaneSize("north", true) // true = include 'spacing' value for pane
        ,    bottom:    getPaneSize("south", true)
        ,    left:    getPaneSize("west", true)
        ,    right:    getPaneSize("east", true)
        ,    width:    0
        ,    height:    0
        };
 
        with (d) { // NOTE: sC = state.container
            // calc center-pane's outer dimensions
            width    = sC.innerWidth - left - right;  // outerWidth
            height    = sC.innerHeight - bottom - top; // outerHeight
            // add the 'container border/padding' to get final positions relative to the container
            top        += sC.insetTop;
            bottom    += sC.insetBottom;
            left    += sC.insetLeft;
            right    += sC.insetRight;
        }
 
        return d;
    };
 
 
    /**
     * getElemDims
     *
     * Returns data for setting size of an element (container or a pane).
     *
     * @callers  _create(), onWindowResize() for container, plus others for pane
     * @returns JSON  Returns a hash of all dimensions: top, bottom, left, right, outerWidth, innerHeight, etc
     */
    var getElemDims = function ($E) {
        var
            d    = {}            // dimensions hash
        ,    x    = d.css = {}    // CSS hash
        ,    i    = {}            // TEMP insets
        ,    b, p                // TEMP border, padding
        ,    off = $E.offset()
        ;
        d.offsetLeft = off.left;
        d.offsetTop  = off.top;
 
        $.each("Left,Right,Top,Bottom".split(","), function (idx, e) {
            b = x["border" + e] = _borderWidth($E, e);
            p = x["padding"+ e] = _cssNum($E, "padding"+e);
            i[e] = b + p; // total offset of content from outer side
            d["inset"+ e] = p;
            /* WRONG ???
            // if BOX MODEL, then 'position' = PADDING (ignore borderWidth)
            if ($E == $Container)
                d["inset"+ e] = (state.browser.boxModel ? p : 0); 
            */
        });
 
        d.offsetWidth    = $E.innerWidth(true); // true=include Padding
        d.offsetHeight    = $E.innerHeight(true);
        d.outerWidth    = $E.outerWidth();
        d.outerHeight    = $E.outerHeight();
        d.innerWidth    = d.outerWidth  - i.Left - i.Right;
        d.innerHeight    = d.outerHeight - i.Top  - i.Bottom;
 
        // TESTING
        x.width  = $E.width();
        x.height = $E.height();
 
        return d;
    };
 
    var getElemCSS = function ($E, list) {
        var
            CSS    = {}
        ,    style    = $E[0].style
        ,    props    = list.split(",")
        ,    sides    = "Top,Bottom,Left,Right".split(",")
        ,    attrs    = "Color,Style,Width".split(",")
        ,    p, s, a, i, j, k
        ;
        for (i=0; i < props.length; i++) {
            p = props[i];
            if (p.match(/(border|padding|margin)$/))
                for (j=0; j < 4; j++) {
                    s = sides[j];
                    if (p == "border")
                        for (k=0; k < 3; k++) {
                            a = attrs[k];
                            CSS[p+s+a] = style[p+s+a];
                        }
                    else
                        CSS[p+s] = style[p+s];
                }
            else
                CSS[p] = style[p];
        };
        return CSS
    };
 
 
    var setTimer = function (name, fn, ms) {
        clearTimer(name); // clear previous timer if exists
        _c.timers[name] = setTimeout(fn, ms);
    };
 
    var clearTimer = function (name) {
        if (_c.timers[name]) {
            clearTimeout(_c.timers[name]);
            delete _c.timers[name];
        }
    };
 
    var isTimerRunning = function (name) {
        return !!_c.timers[name];
    }
 
    var getHoverClasses = function (el, allStates) {
        var
            $El        = $(el)
        ,    type    = $El.data("layoutRole")
        ,    pane    = $El.data("layoutEdge")
        ,    o        = options[pane]
        ,    root    = o[type +"Class"]
        ,    _pane    = "-"+ pane // eg: "-west"
        ,    _open    = "-open"
        ,    _closed    = "-closed"
        ,    _slide    = "-sliding"
        ,    _hover    = "-hover " // NOTE the trailing space
        ,    _state    = $El.hasClass(root+_closed) ? _closed : _open
        ,    _alt    = _state == _closed ? _open : _closed
        ,    classes = (root+_hover) + (root+_pane+_hover) + (root+_state+_hover) + (root+_pane+_state+_hover)
        ;
        if (allStates) // when 'removing' classes, also remove alternate-state classes
            classes += (root+_alt+_hover) + (root+_pane+_alt+_hover);
 
        if (type=="resizer" && $El.hasClass(root+_slide))
            classes += (root+_slide+_hover) + (root+_pane+_slide+_hover);
 
        return $.trim(classes);
    };
    var addHover    = function (evt, el) {
        var e = el || this;
        $(e).addClass( getHoverClasses(e) );
        //if (evt && $(e).data("layoutRole") == "toggler") evt.stopPropagation();
    };
    var removeHover    = function (evt, el) {
        var e = el || this;
        $(e).removeClass( getHoverClasses(e, true) );
    };
 
/*
 * ###########################
 *   INITIALIZATION METHODS
 * ###########################
 */
 
    /**
     * _create
     *
     * Initialize the layout - called automatically whenever an instance of layout is created
     *
     * @callers  none - triggered onInit
     * @returns  An object pointer to the instance created
     */
    var _create = function () {
        // initialize config/options
        initOptions();
        var o = options;
 
        // onload will CANCEL resizing if returns false
        if (false === _execCallback(null, o.onload)) return false;
 
        // a center pane is required, so make sure it exists
        if (!getPane('center').length) {
            alert( lang.errCenterPaneMissing );
            return null;
        }
 
        // update options with saved state, if option enabled
        if (o.useStateCookie && o.cookie.autoLoad)
            loadCookie(); // Update options from state-cookie
 
        // set environment - can update code here if $.browser is phased out
        state.browser = {
            mozilla:    $.browser.mozilla
        ,    msie:        $.browser.msie
        ,    isIE6:        $.browser.msie && $.browser.version == 6
        ,    boxModel:    $.support.boxModel
        //,    version:    $.browser.version - not used
        };
 
        // initialize all layout elements
        initContainer();    // set CSS as needed and init state.container dimensions
        initPanes();        // size & position all panes - calls initHandles()
        //initHandles();    // create and position all resize bars & togglers buttons
        initResizable();    // activate resizing on all panes where resizable=true
        sizeContent("all");    // AFTER panes & handles have been initialized, size 'content' divs
 
        if (o.scrollToBookmarkOnLoad)
            with (self.location) if (hash) replace( hash ); // scrollTo Bookmark
 
        // search for and bind custom-buttons
        if (o.autoBindCustomButtons) initButtons();
 
        // bind hotkey function - keyDown - if required
        initHotkeys();
        // track mouse position so we can use it anytime we need it
        initMouseTracking();
 
        // bind resizeAll() for 'this layout instance' to window.resize event
        if (o.resizeWithWindow && !$Container.data("layoutRole")) // skip if 'nested' inside a pane
            $(window).bind("resize."+ sID, windowResize);
 
        // bind window.onunload
        $(window).bind("unload."+ sID, unload);
 
        state.initialized = true;
    };
 
    var windowResize = function () {
        var delay = Number(options.resizeWithWindowDelay) || 100; // there MUST be some delay!
        if (delay > 0) {
            // resizing uses a delay-loop because the resize event fires repeatly - except in FF, but delay anyway
            clearTimer("winResize"); // if already running
            setTimer("winResize", function(){ clearTimer("winResize"); clearTimer("winResizeRepeater"); resizeAll(); }, delay);
            // ALSO set fixed-delay timer, if not already running
            if (!_c.timers["winResizeRepeater"]) setWindowResizeRepeater();
        }
    };
 
    var setWindowResizeRepeater = function () {
        var delay = Number(options.resizeWithWindowMaxDelay);
        if (delay > 0)
            setTimer("winResizeRepeater", function(){ setWindowResizeRepeater(); resizeAll(); }, delay);
    };
 
    var unload = function () {
        var o = options;
        state.cookie = getState(); // save state in case onunload has custom state-management
        if (o.useStateCookie && o.cookie.autoSave) saveCookie();
 
        _execCallback(null, o.onunload);
    };
 
    /**
     *    initMouseTracking / trackMouse / isMouseOver
     *
     *    Bound to document.mousemove - updates window.mouseCoords.X/Y
     *
     *    TODO: use ui.isOver(y, x, top, left, height, width)
     */
    var initMouseTracking = function () {
        if (!window.mouseCoords) { // only need 1 mouse tracker!
            window.mouseCoords = { X: 0, Y: 0 }; // init
            $(document).bind("mousemove."+ sID, trackMouse);
        }
    };
    var trackMouse = function (evt) {
        var m = window.mouseCoords;
        m.X = evt.pageX;
        m.Y = evt.pageY;
    };
    var isMouseOver = function (el) {
        var $E    = (typeof el == "string" && $Ps[el]) ? $Ps[el] : $(el);
        if (!$E.length) return false;
        var
            _    = this
        ,    d    = $E.offset()
        ,    T    = d.top
        ,    L    = d.left
        ,    R    = L + $E.outerWidth()
        ,    B    = T + $E.outerHeight()
        ,    m    = window.mouseCoords
        ;
        return ((m.X >= L && m.X <= R) && (m.Y >= T && m.Y <= B));
    };
 
 
    /**
     * initContainer
     *
     * Validate and initialize container CSS and events
     *
     * @callers  _create()
     */
    var initContainer = function () {
            sC.tagName    = $Container.attr("tagName");
        var
            isFullPage    = (sC.tagName == "BODY")
        ,    $C        = $Container // alias
        ,    props    = "position,margin,padding,border"
        ,    CSS        = {}
        ;
            sC.ref    = sC.tagName + ($C.selector || "").split(".slice")[0];
 
        // the layoutContainer key is used to store the unique layoutID
        $C
            .data("layoutContainer", sID)        // unique identifier for internal use
            .data("layoutName", options.name)    // add user's layout-name - even if blank!
        ;
 
        // SAVE original container CSS for use in destroy()
        if (!$C.data("layoutCSS")) {
            // handle props like overflow different for BODY & HTML - has 'system default' values
            if (isFullPage) {
                CSS = $.extend( getElemCSS($C, props), {
                    height:        $C.css("height")
                ,    overflow:    $C.css("overflow")
                ,    overflowX:    $C.css("overflowX")
                ,    overflowY:    $C.css("overflowY")
                });
                // ALSO SAVE <HTML> CSS
                var $H = $("html");
                $H.data("layoutCSS", {
                    height:        "auto" // FF would return a fixed px-size!
                ,    overflow:    $H.css("overflow")
                ,    overflowX:    $H.css("overflowX")
                ,    overflowY:    $H.css("overflowY")
                });
            }
            else // handle props normally for non-body elements
                CSS = getElemCSS($C, props+",top,bottom,left,right,width,height,overflow,overflowX,overflowY");
 
            $C.data("layoutCSS", CSS);
        }
 
        try { // format html/body if this is a full page layout
            if (isFullPage) {
                $("html").css({
                    height:        "100%"
                ,    overflow:    "hidden"
                ,    overflowX:    "hidden"
                ,    overflowY:    "hidden"
                });
                $("body").css({
                    position:    "relative"
                ,    height:        "100%"
                ,    overflow:    "hidden"
                ,    overflowX:    "hidden"
                ,    overflowY:    "hidden"
                ,    margin:        0
                ,    padding:    0        // TODO: test whether body-padding could be handled?
                ,    border:        "none"    // a body-border creates problems because it cannot be measured!
                });
            }
            else { // set required CSS for overflow and position
                var
                    CSS    = { overflow: "hidden" } // make sure container will not 'scroll'
                ,    p    = $C.css("position")
                ,    h    = $C.css("height")
                ;
                // if this is a NESTED layout, then container/outer-pane ALREADY has position and height
                if (!$C.data("layoutRole")) {
                    if (!p || !p.match(/fixed|absolute|relative/))
                        CSS.position = "relative"; // container MUST have a 'position'
                    /*
                    if (!h || h=="auto")
                        CSS.height = "100%"; // container MUST have a 'height'
                    */
                }
                $C.css( CSS );
                if ($C.is(":visible") && $C.innerHeight() < 2)
                    alert( lang.errContainerHeight.replace(/CONTAINER/, sC.ref) );
            }
        } catch (ex) {}
 
        // set current layout-container dimensions
        $.extend(state.container, getElemDims( $C ));
    };
 
    /**
     * initHotkeys
     *
     * Bind layout hotkeys - if options enabled
     *
     * @callers  _create()
     */
    var initHotkeys = function () {
        // bind keyDown to capture hotkeys, if option enabled for ANY pane
        $.each(_c.borderPanes.split(","), function (i, pane) {
            var o = options[pane];
            if (o.enableCursorHotkey || o.customHotkey) {
                $(document).bind("keydown."+ sID, keyDown); // only need to bind this ONCE
                return false; // BREAK - binding was done
            }
        });
    };
 
    /**
     * initOptions
     *
     * Build final OPTIONS data
     *
     * @callers  _create()
     */
    var initOptions = function () {
        // simplify logic by making sure passed 'opts' var has basic keys
        opts = _transformData( opts );
 
        // TODO: create a compatibility add-on for new UI widget that will transform old option syntax
        var newOpts = {
            applyDefaultStyles:        "applyDemoStyles"
        };
        renameOpts(opts.defaults);
        $.each(_c.allPanes.split(","), function (i, pane) {
            renameOpts(opts[pane]);
        });
 
        // update default effects, if case user passed key
        if (opts.effects) {
            $.extend( effects, opts.effects );
            delete opts.effects;
        }
        $.extend( options.cookie, opts.cookie );
 
        // see if any 'global options' were specified
        var globals = "name,zIndex,scrollToBookmarkOnLoad,resizeWithWindow,resizeWithWindowDelay,resizeWithWindowMaxDelay,"+
            "onresizeall,onresizeall_start,onresizeall_end,onload,onunload,autoBindCustomButtons,useStateCookie";
        $.each(globals.split(","), function (i, key) {
            if (opts[key] !== undefined)
                options[key] = opts[key];
            else if (opts.defaults[key] !== undefined) {
                options[key] = opts.defaults[key];
                delete opts.defaults[key];
            }
        });
 
        // remove any 'defaults' that MUST be set 'per-pane'
        $.each("paneSelector,resizerCursor,customHotkey".split(","),
            function (i, key) { delete opts.defaults[key]; } // is OK if key does not exist
        );
 
        // now update options.defaults
        $.extend( true, options.defaults, opts.defaults );
 
        // merge config for 'center-pane' - border-panes handled in the loop below
        _c.center = $.extend( true, {}, _c.panes, _c.center );
        // update config.zIndex values if zIndex option specified
        var z = options.zIndex;
        if (z === 0 || z > 0) {
            _c.zIndex.pane_normal        = z;
            _c.zIndex.resizer_normal    = z+1;
            _c.zIndex.iframe_mask        = z+1;
        }
 
        // merge options for 'center-pane' - border-panes handled in the loop below
        $.extend( options.center, opts.center );
        // Most 'default options' do not apply to 'center', so add only those that DO
        var o_Center = $.extend( true, {}, options.defaults, opts.defaults, options.center ); // TEMP data
        $.each("paneClass,contentSelector,applyDemoStyles,showOverflowOnHover,triggerEventsOnLoad".split(","),
            function (i, key) { options.center[key] = o_Center[key]; }
        );
 
        var o, defs = options.defaults;
 
        // create a COMPLETE set of options for EACH border-pane
        $.each(_c.borderPanes.split(","), function (i, pane) {
 
            // apply 'pane-defaults' to CONFIG.[PANE]
            _c[pane] = $.extend( true, {}, _c.panes, _c[pane] );
 
            // apply 'pane-defaults' +  user-options to OPTIONS.PANE
            o = options[pane] = $.extend( true, {}, options.defaults, options[pane], opts.defaults, opts[pane] );
 
            // make sure we have base-classes
            if (!o.paneClass)        o.paneClass        = "ui-layout-pane";
            if (!o.resizerClass)    o.resizerClass    = "ui-layout-resizer";
            if (!o.togglerClass)    o.togglerClass    = "ui-layout-toggler";
 
            // create FINAL fx options for each pane, ie: options.PANE.fxName/fxSpeed/fxSettings[_open|_close]
            $.each(["_open","_close",""], function (i,n) { 
                var
                    sName        = "fxName"+n
                ,    sSpeed        = "fxSpeed"+n
                ,    sSettings    = "fxSettings"+n
                ;
                // recalculate fxName according to specificity rules
                o[sName] =
                    opts[pane][sName]        // opts.west.fxName_open
                ||    opts[pane].fxName        // opts.west.fxName
                ||    opts.defaults[sName]    // opts.defaults.fxName_open
                ||    opts.defaults.fxName    // opts.defaults.fxName
                ||    o[sName]                // options.west.fxName_open
                ||    o.fxName                // options.west.fxName
                ||    defs[sName]                // options.defaults.fxName_open
                ||    defs.fxName                // options.defaults.fxName
                ||    "none"
                ;
                // validate fxName to be sure is a valid effect
                var fxName = o[sName];
                if (fxName == "none" || !$.effects || !$.effects[fxName] || (!effects[fxName] && !o[sSettings] && !o.fxSettings))
                    fxName = o[sName] = "none"; // effect not loaded, OR undefined FX AND fxSettings not passed
                // set vars for effects subkeys to simplify logic
                var
                    fx = effects[fxName]    || {} // effects.slide
                ,    fx_all    = fx.all        || {} // effects.slide.all
                ,    fx_pane    = fx[pane]        || {} // effects.slide.west
                ;
                // RECREATE the fxSettings[_open|_close] keys using specificity rules
                o[sSettings] = $.extend(
                    {}
                ,    fx_all                        // effects.slide.all
                ,    fx_pane                        // effects.slide.west
                ,    defs.fxSettings || {}        // options.defaults.fxSettings
                ,    defs[sSettings] || {}        // options.defaults.fxSettings_open
                ,    o.fxSettings                // options.west.fxSettings
                ,    o[sSettings]                // options.west.fxSettings_open
                ,    opts.defaults.fxSettings    // opts.defaults.fxSettings
                ,    opts.defaults[sSettings] || {} // opts.defaults.fxSettings_open
                ,    opts[pane].fxSettings        // opts.west.fxSettings
                ,    opts[pane][sSettings] || {}    // opts.west.fxSettings_open
                );
                // recalculate fxSpeed according to specificity rules
                o[sSpeed] =
                    opts[pane][sSpeed]        // opts.west.fxSpeed_open
                ||    opts[pane].fxSpeed        // opts.west.fxSpeed (pane-default)
                ||    opts.defaults[sSpeed]    // opts.defaults.fxSpeed_open
                ||    opts.defaults.fxSpeed    // opts.defaults.fxSpeed
                ||    o[sSpeed]                // options.west.fxSpeed_open
                ||    o[sSettings].duration    // options.west.fxSettings_open.duration
                ||    o.fxSpeed                // options.west.fxSpeed
                ||    o.fxSettings.duration    // options.west.fxSettings.duration
                ||    defs.fxSpeed            // options.defaults.fxSpeed
                ||    defs.fxSettings.duration// options.defaults.fxSettings.duration
                ||    fx_pane.duration        // effects.slide.west.duration
                ||    fx_all.duration            // effects.slide.all.duration
                ||    "normal"                // DEFAULT
                ;
            });
 
        });
 
        function renameOpts (O) {
            for (var key in newOpts) {
                if (O[key] != undefined) {
                    O[newOpts[key]] = O[key];
                    delete O[key];
                }
            }
        }
    };
 
    /**
     * initPanes
     *
     * Initialize module objects, styling, size and position for all panes
     *
     * @callers  _create()
     */
    var getPane = function (pane) {
        var sel = options[pane].paneSelector
        if (sel.substr(0,1)==="#") // ID selector
            // NOTE: elements selected 'by ID' DO NOT have to be 'children'
            return $Container.find(sel).eq(0);
        else { // class or other selector
            var $P = $Container.children(sel).eq(0);
            // look for the pane nested inside a 'form' element
            return $P.length ? $P : $Container.children("form:first").children(sel).eq(0);
        }
    };
    var initPanes = function () {
        // NOTE: do north & south FIRST so we can measure their height - do center LAST
        $.each(_c.allPanes.split(","), function (idx, pane) {
            var
                o        = options[pane]
            ,    s        = state[pane]
            ,    c        = _c[pane]
            ,    fx        = s.fx
            ,    dir        = c.dir
            ,    spacing    = o.spacing_open || 0
            ,    isCenter = (pane == "center")
            ,    CSS        = {}
            ,    $P, $C
            ,    size, minSize, maxSize
            ;
            $Cs[pane] = false; // init
 
            $P = $Ps[pane] = getPane(pane);
            if (!$P.length) {
                $Ps[pane] = false; // logic
                return true; // SKIP to next
            }
 
            // SAVE original Pane CSS
            if (!$P.data("layoutCSS")) {
                var props = "position,top,left,bottom,right,width,height,overflow,zIndex,display,backgroundColor,padding,margin,border";
                $P.data("layoutCSS", getElemCSS($P, props));
            }
 
            // add basic classes & attributes
            $P
                .data("layoutName", options.name)    // add user's layout-name - even if blank!
                .data("layoutRole", "pane")
                .data("layoutEdge", pane)
                .css(c.cssReq).css("zIndex", _c.zIndex.pane_normal)
                .css(o.applyDemoStyles ? c.cssDemo : {}) // demo styles
                .addClass( o.paneClass +" "+ o.paneClass+"-"+pane ) // default = "ui-layout-pane ui-layout-pane-west" - may be a dupe of 'paneSelector'
                .bind("mouseenter."+ sID, addHover )
                .bind("mouseleave."+ sID, removeHover )
            ;
 
            // see if this pane has a 'scrolling-content element'
            if (o.contentSelector) {
                $C = $Cs[pane] = $P.find(o.contentSelector).eq(0); // match 1-element only
                if (!$C.length)
                    $Cs[pane] = false;
                else {
                    $C.css( _c.content.cssReq );
                    if (o.applyDemoStyles) {
                        $C.css( _c.content.cssDemo ); // add padding & overflow: auto to content-div
                        $P.css( _c.content.cssDemoPane ); // REMOVE padding/scrolling from pane
                    }
                    s.content = {}; // init content state
                    // sizeContent() is called later
                }
            }
 
            if (!isCenter) {
                // call _parseSize AFTER applying pane classes & styles - but before making visible (if hidden)
                // if o.size is auto or not valid, then MEASURE the pane and use that as it's 'size'
                size    = s.size = _parseSize(pane, o.size);
                minSize    = _parseSize(pane,o.minSize) || 1;
                maxSize    = _parseSize(pane,o.maxSize) || 100000;
                if (size > 0) size = max(min(size, maxSize), minSize);
            }
 
            // init pane-logic vars
                s.tagName    = $P.attr("tagName");
                s.noRoom    = false; // true = pane 'automatically' hidden due to insufficient room - will unhide automatically
                s.isVisible    = true;  // false = pane is invisible - closed OR hidden - simplify logic
            if (!isCenter) {
                s.isClosed  = false; // true = pane is closed
                s.isSliding = false; // true = pane is currently open by 'sliding' over adjacent panes
                s.isResizing= false; // true = pane is in process of being resized
                s.isHidden    = false; // true = pane is hidden - no spacing, resizer or toggler is visible!
            }
 
            // set css-position to account for container borders & padding
            switch (pane) {
                case "north":     CSS.top     = sC.insetTop;
                                CSS.left     = sC.insetLeft;
                                CSS.right    = sC.insetRight;
                                break;
                case "south":     CSS.bottom    = sC.insetBottom;
                                CSS.left     = sC.insetLeft;
                                CSS.right     = sC.insetRight;
                                break;
                case "west":     CSS.left     = sC.insetLeft; // top, bottom & height set by sizeMidPanes()
                                break;
                case "east":     CSS.right     = sC.insetRight; // ditto
                                break;
                case "center":    // top, left, width & height set by sizeMidPanes()
            }
 
            if (dir == "horz") // north or south pane
                CSS.height = max(1, cssH(pane, size));
            else if (dir == "vert") // east or west pane
                CSS.width = max(1, cssW(pane, size));
            //else if (isCenter) {}
 
            $P.css(CSS); // apply size -- top, bottom & height will be set by sizeMidPanes
            if (dir != "horz") sizeMidPanes(pane, true); // true = skipCallback
 
            // NOW make the pane visible - in case was initially hidden
            $P.css({ visibility: "visible", display: "block" });
 
            // close or hide the pane if specified in settings
            if (o.initClosed && o.closable)
                close(pane, true, true); // true, true = force, noAnimation
            else if (o.initHidden || o.initClosed)
                hide(pane); // will be completely invisible - no resizer or spacing
            // ELSE setAsOpen() - called later by initHandles()
 
            // check option for auto-handling of pop-ups & drop-downs
            if (o.showOverflowOnHover)
                $P.hover( allowOverflow, resetOverflow );
        });
 
        /*
         *    init the pane-handles NOW in case we have to hide or close the pane below
         */
        initHandles();
 
        // now that all panes have been initialized and initially-sized,
        // make sure there is really enough space available for each pane
        $.each(_c.borderPanes.split(","), function (i, pane) {
            if ($Ps[pane] && state[pane].isVisible) { // pane is OPEN
                setSizeLimits(pane);
                makePaneFit(pane); // pane may be Closed, Hidden or Resized by makePaneFit()
            }
        });
        // size center-pane AGAIN in case we 'closed' a border-pane in loop above
        sizeMidPanes("center");
 
        // trigger onResize callbacks for all panes with triggerEventsOnLoad = true
        $.each(_c.allPanes.split(","), function (i, pane) {
            o = options[pane];
            if ($Ps[pane] && o.triggerEventsOnLoad && state[pane].isVisible) // pane is OPEN
                _execCallback(pane, o.onresize_end || o.onresize); // call onresize
        });
 
        if ($Container.innerHeight() < 2)
            alert( lang.errContainerHeight.replace(/CONTAINER/, sC.ref) );
    };
 
    /**
     * initHandles
     *
     * Initialize module objects, styling, size and position for all resize bars and toggler buttons
     *
     * @callers  _create()
     */
    var initHandles = function (panes) {
        if (!panes || panes == "all") panes = _c.borderPanes;
 
        // create toggler DIVs for each pane, and set object pointers for them, eg: $R.north = north toggler DIV
        $.each(panes.split(","), function (i, pane) {
            var $P        = $Ps[pane];
            $Rs[pane]    = false; // INIT
            $Ts[pane]    = false;
            if (!$P) return; // pane does not exist - skip
 
            var 
                o        = options[pane]
            ,    s        = state[pane]
            ,    c        = _c[pane]
            ,    rClass    = o.resizerClass
            ,    tClass    = o.togglerClass
            ,    side    = c.side.toLowerCase()
            ,    spacing    = (s.isVisible ? o.spacing_open : o.spacing_closed)
            ,    _pane    = "-"+ pane // used for classNames
            ,    _state    = (s.isVisible ? "-open" : "-closed") // used for classNames
                // INIT RESIZER BAR
            ,    $R        = $Rs[pane] = $("<div></div>")
                // INIT TOGGLER BUTTON
            ,    $T        = (o.closable ? $Ts[pane] = $("<div></div>") : false)
            ;
 
            if (s.isVisible && o.resizable)
                ; // handled by initResizable
            else if (!s.isVisible && o.slidable)
                $R.attr("title", o.sliderTip).css("cursor", o.sliderCursor);
 
            $R
                // if paneSelector is an ID, then create a matching ID for the resizer, eg: "#paneLeft" => "paneLeft-resizer"
                .attr("id", (o.paneSelector.substr(0,1)=="#" ? o.paneSelector.substr(1) + "-resizer" : ""))
                .data("layoutRole", "resizer")
                .data("layoutEdge", pane)
                .css(_c.resizers.cssReq).css("zIndex", _c.zIndex.resizer_normal)
                .css(o.applyDemoStyles ? _c.resizers.cssDemo : {}) // add demo styles
                .addClass(rClass +" "+ rClass+_pane)
                .appendTo($Container) // append DIV to container
                .hover( addHover, removeHover )
            ;
 
            if ($T) {
                $T
                    // if paneSelector is an ID, then create a matching ID for the resizer, eg: "#paneLeft" => "#paneLeft-toggler"
                    .attr("id", (o.paneSelector.substr(0,1)=="#" ? o.paneSelector.substr(1) + "-toggler" : ""))
                    .data("layoutRole", "toggler")
                    .data("layoutEdge", pane)
                    .css(_c.togglers.cssReq) // add base/required styles
                    .css(o.applyDemoStyles ? _c.togglers.cssDemo : {}) // add demo styles
                    .addClass(tClass +" "+ tClass+_pane)
                    .appendTo($R) // append SPAN to resizer DIV
                    .click(function(evt){ toggle(pane); evt.stopPropagation(); })
                    .hover( addHover, removeHover )
                ;
                // ADD INNER-SPANS TO TOGGLER
                if (o.togglerContent_open) // ui-layout-open
                    $("<span>"+ o.togglerContent_open +"</span>")
                        .data("layoutRole", "togglerContent")
                        .data("layoutEdge", pane)
                        .addClass("content content-open")
                        .css("display","none")
                        .appendTo( $T )
                        .hover( addHover, removeHover )
                    ;
                if (o.togglerContent_closed) // ui-layout-closed
                    $("<span>"+ o.togglerContent_closed +"</span>")
                        .data("layoutRole", "togglerContent")
                        .data("layoutEdge", pane)
                        .addClass("content content-closed")
                        .css("display","none")
                        .appendTo( $T )
                        .hover( addHover, removeHover )
                    ;
            }
 
            // ADD CLASSNAMES & SLIDE-BINDINGS - eg: class="resizer resizer-west resizer-open"
            if (s.isVisible)
                setAsOpen(pane);    // onOpen will be called, but NOT onResize
            else {
                setAsClosed(pane);    // onClose will be called
                bindStartSlidingEvent(pane, true); // will enable events IF option is set
            }
 
        });
 
        // SET ALL HANDLE DIMENSIONS
        sizeHandles("all");
    };
 
    /**
     * initButtons
     *
     * Searches for .ui-layout-button-xxx elements and auto-binds them as layout-buttons
     *
     * @callers  _create()
     */
    var initButtons = function () {
        var pre    = "ui-layout-button-", name;
        $.each("toggle,open,close,pin,toggle-slide,open-slide".split(","), function (i, action) {
            $.each(_c.borderPanes.split(","), function (ii, pane) {
                $("."+pre+action+"-"+pane).each(function(){
                    // if button was previously 'bound', data.layoutName was set, but is blank if layout has no 'name'
                    name = $(this).data("layoutName") || $(this).attr("layoutName");
                    if (name == undefined || name == options.name) {
                        if (action.substr("-slide") > 0)
                            bindButton(this, action.split("-")[0], pane, true)
                        else
                            bindButton(this, action, pane);
                    }
                });
            });
        });
    };
 
    /**
     * initResizable
     *
     * Add resize-bars to all panes that specify it in options
     *
     * @dependancies  $.fn.resizable - will skip if not found
     * @callers  _create()
     */
    var initResizable = function (panes) {
        var
            draggingAvailable = (typeof $.fn.draggable == "function")
        ,    $Frames, side // set in start()
        ;
        if (!panes || panes == "all") panes = _c.borderPanes;
 
        $.each(panes.split(","), function (idx, pane) {
            var 
                o    = options[pane]
            ,    s    = state[pane]
            ,    c    = _c[pane]
            ,    side = (c.dir=="horz" ? "top" : "left")
            ,    r, live // set in start because may change
            ;
            if (!draggingAvailable || !$Ps[pane] || !o.resizable) {
                o.resizable = false;
                return true; // skip to next
            }
 
            var 
                $P         = $Ps[pane]
            ,    $R        = $Rs[pane]
            ,    base    = o.resizerClass
            //    'drag' classes are applied to the ORIGINAL resizer-bar while dragging is in process
            ,    resizerClass        = base+"-drag"                // resizer-drag
            ,    resizerPaneClass    = base+"-"+pane+"-drag"        // resizer-north-drag
            //    'helper' class is applied to the CLONED resizer-bar while it is being dragged
            ,    helperClass            = base+"-dragging"            // resizer-dragging
            ,    helperPaneClass        = base+"-"+pane+"-dragging" // resizer-north-dragging
            ,    helperLimitClass    = base+"-dragging-limit"    // resizer-drag
            ,    helperClassesSet    = false                     // logic var
            ;
 
            if (!s.isClosed)
                $R
                    .attr("title", o.resizerTip)
                    .css("cursor", o.resizerCursor) // n-resize, s-resize, etc
                ;
 
            $R.draggable({
                containment:    $Container[0] // limit resizing to layout container
            ,    axis:            (c.dir=="horz" ? "y" : "x") // limit resizing to horz or vert axis
            ,    delay:            100
            ,    distance:        1
            //    basic format for helper - style it using class: .ui-draggable-dragging
            ,    helper:            "clone"
            ,    opacity:        o.resizerDragOpacity
            ,    addClasses:        false // avoid ui-state-disabled class when disabled
            //,    iframeFix:        o.draggableIframeFix // TODO: consider using when bug is fixed
            ,    zIndex:            _c.zIndex.resizer_drag
 
            ,    start: function (e, ui) {
                    // REFRESH options & state pointers in case we used swapPanes
                    o = options[pane];
                    s = state[pane];
                    // re-read options
                    live = o.resizeWhileDragging;
 
                    // onresize_start callback - will CANCEL hide if returns false
                    // TODO: CONFIRM that dragging can be cancelled like this???
                    if (false === _execCallback(pane, o.onresize_start)) return false;
 
                    _c.isLayoutBusy    = true; // used by sizePane() logic during a liveResize
                    s.isResizing    = true; // prevent pane from closing while resizing
                    clearTimer(pane+"_closeSlider"); // just in case already triggered
 
                    // SET RESIZER LIMITS - used in drag()
                    setSizeLimits(pane); // update pane/resizer state
                    r = s.resizerPosition;
 
                    $R.addClass( resizerClass +" "+ resizerPaneClass ); // add drag classes
                    helperClassesSet = false; // reset logic var - see drag()
 
                    // MASK PANES WITH IFRAMES OR OTHER TROUBLESOME ELEMENTS
                    $Frames = $(o.maskIframesOnResize === true ? "iframe" : o.maskIframesOnResize).filter(":visible");
                    var id, i=0; // ID incrementer - used when 'resizing' masks during dynamic resizing
                    $Frames.each(function() {                    
                        id = "ui-layout-mask-"+ (++i);
                        $(this).data("layoutMaskID", id); // tag iframe with corresponding maskID
                        $('<div id="'+ id +'" class="ui-layout-mask ui-layout-mask-'+ pane +'"/>')
                            .css({
                                background:    "#fff"
                            ,    opacity:    "0.001"
                            ,    zIndex:        _c.zIndex.iframe_mask
                            ,    position:    "absolute"
                            ,    width:        this.offsetWidth+"px"
                            ,    height:        this.offsetHeight+"px"
                            })
                            .css($(this).position()) // top & left -- changed from offset()
                            .appendTo(this.parentNode) // put mask-div INSIDE pane to avoid zIndex issues
                        ;
                    });
 
                    // DISABLE TEXT SELECTION - particularly for WebKit browsers, Safari & Chrome
                    if (o.noSelectionWhileDragging) $(document).disableSelection(); 
                }
 
            ,    drag: function (e, ui) {
                    if (!helperClassesSet) { // can only add classes after clone has been added to the DOM
                        //$(".ui-draggable-dragging")
                        ui.helper
                            .addClass( helperClass +" "+ helperPaneClass ) // add helper classes
                            .children().css("visibility","hidden") // hide toggler inside dragged resizer-bar
                        ;
                        helperClassesSet = true;
                        // draggable bug!? RE-SET zIndex to prevent E/W resize-bar showing through N/S pane!
                        if (s.isSliding) $Ps[pane].css("zIndex", _c.zIndex.pane_sliding);
                    }
                    // CONTAIN RESIZER-BAR TO RESIZING LIMITS
                    var limit = 0;
                    if (ui.position[side] < r.min) {
                        ui.position[side] = r.min;
                        limit = -1;
                    }
                    else if (ui.position[side] > r.max) {
                        ui.position[side] = r.max;
                        limit = 1;
                    }
                    // ADD/REMOVE dragging-limit CLASS
                    if (limit) {
                        ui.helper.addClass( helperLimitClass ); // at dragging-limit
                        window.defaultStatus = "Panel has reached its "+ (limit>0 ? "maximum" : "minimum") +" size";
                    }
                    else {
                        ui.helper.removeClass( helperLimitClass ); // not at dragging-limit
                        window.defaultStatus = "";
                    }
                    // DYNAMICALLY RESIZE PANES IF OPTION ENABLED
                    if (live) resizePanes(e, ui, pane);
                }
 
            ,    stop: function (e, ui) {
                    // RE-ENABLE TEXT SELECTION
                    if (o.noSelectionWhileDragging) $(document).enableSelection(); 
                    window.defaultStatus = ""; // clear 'resizing limit' message from statusbar
                    $R.removeClass( resizerClass +" "+ resizerPaneClass +" "+ helperLimitClass ); // remove drag classes from Resizer
                    s.isResizing = false;
                    _c.isLayoutBusy    = false; // set BEFORE resizePanes so other logic can pick it up
                    resizePanes(e, ui, pane, true); // true = resizingDone
                }
 
            });
 
            /**
             * resizePanes
             *
             * Sub-routine called from stop() and optionally drag()
             */
            var resizePanes = function (e, ui, pane, resizingDone) {
                var 
                    dragPos    = ui.position
                ,    c        = _c[pane]
                ,    resizerPos, newSize
                ,    i = 0 // ID incrementer
                ;
                switch (pane) {
                    case "north":    resizerPos = dragPos.top; break;
                    case "west":    resizerPos = dragPos.left; break;
                    case "south":    resizerPos = sC.offsetHeight - dragPos.top  - o.spacing_open; break;
                    case "east":    resizerPos = sC.offsetWidth  - dragPos.left - o.spacing_open; break;
                };
 
                // remove container margin from resizer position to get the pane size
                newSize = resizerPos - sC["inset"+ c.side];
                manualSizePane(pane, newSize);
 
                if (resizingDone) {
                    // Remove OR Resize MASK(S) created in drag.start
                    $("div.ui-layout-mask").each(function() { this.parentNode.removeChild(this); });
                    //$("div.ui-layout-mask").remove(); // TODO: Is this less efficient?
                }
                else
                    $Frames.each(function() {
                        $("#"+ $(this).data("layoutMaskID")) // get corresponding mask by ID
                            .css($(this).position()) // update top & left
                            .css({ // update width & height
                                width:    this.offsetWidth +"px"
                            ,    height:    this.offsetHeight+"px"
                            })
                        ;
                    });
            }
        });
    };
 
 
    /**
     *    destroy
     *
     *    Destroy this layout and reset all elements
     */
    var destroy = function () {
        // UNBIND layout events and remove global object
        $(window).unbind("."+ sID);
        $(document).unbind("."+ sID);
        window[ sID ] = null;
 
        var
            isFullPage    = (sC.tagName == "BODY")
        //    create list of ALL pane-classes that need to be removed
        ,    root    = o.paneClass // default="ui-layout-pane"
        ,    _open    = "-open"
        ,    _sliding= "-sliding"
        ,    _closed    = "-closed"
        ,    generic = [ root, root+_open, root+_closed, root+_sliding ] // generic classes
        ,    $P, pRoot, pClasses // loop vars
        ;
        // loop all panes to remove layout classes, attributes and bindings
        $.each(_c.allPanes.split(","), function (i, pane) {
            $P = $Ps[pane];
            if (!$P) return true; // no pane - SKIP
 
            // REMOVE pane's resizer and toggler elements
            if (pane != "center") {
                $Ts[pane].remove();
                $Rs[pane].remove();
            }
 
            pRoot = root+"-"+pane; // eg: "ui-layout-pane-west"
            pClasses = []; // reset
            pClasses.push( pRoot );
            pClasses.push( pRoot+_open );
            pClasses.push( pRoot+_closed );
            pClasses.push( pRoot+_sliding );
 
            $.merge(pClasses, generic); // ADD generic classes
            $.merge(pClasses, getHoverClasses($P, true)); // ADD hover-classes
 
            $P
                .removeClass( pClasses.join(" ") ) // remove ALL pane-classes
                .removeData("layoutRole")
                .removeData("layoutEdge")
                .unbind("."+ sID) // remove ALL Layout events
                // TODO: remove these extra unbind commands when jQuery is fixed
                .unbind("mouseenter")
                .unbind("mouseleave")
            ;
 
            // do NOT reset CSS if this pane is STILL the container of a nested layout!
            // the nested layout will reset its 'container' when/if it is destroyed
            if (!$P.data("layoutContainer"))
                $P.css( $P.data("layoutCSS") );
        });
 
        // reset layout-container
        $Container.removeData("layoutContainer");
 
        // do NOT reset container CSS if is a 'pane' in an outer-layout - ie, THIS layout is 'nested'
        if (!$Container.data("layoutEdge"))
            $Container.css( $Container.data("layoutCSS") ); // RESET CSS
        // for full-page layouts, must also reset the <HTML> CSS
        if (isFullPage)
            $("html").css( $("html").data("layoutCSS") ); // RESET CSS
 
        // trigger state-management and onunload callback
        unload();
 
        var n = options.name; // layout-name
        if (n && window[n]) window[n] = null; // clear window object, if exists
    };
 
 
/*
 * ###########################
 *       ACTION METHODS
 * ###########################
 */
 
    /**
     * hide / show
     *
     * Completely 'hides' a pane, including its spacing - as if it does not exist
     * The pane is not actually 'removed' from the source, so can use 'show' to un-hide it
     *
     * @param String  pane   The pane being hidden, ie: north, south, east, or west
     */
    var hide = function (pane, noAnimation) {
        var
            o    = options[pane]
        ,    s    = state[pane]
        ,    $P    = $Ps[pane]
        ,    $R    = $Rs[pane]
        ;
        if (!$P || s.isHidden) return; // pane does not exist OR is already hidden
 
        // onhide_start callback - will CANCEL hide if returns false
        if (state.initialized && false === _execCallback(pane, o.onhide_start)) return;
 
        s.isSliding = false; // just in case
 
        // now hide the elements
        if ($R) $R.hide(); // hide resizer-bar
        if (!state.initialized || s.isClosed) {
            s.isClosed = true; // to trigger open-animation on show()
            s.isHidden  = true;
            s.isVisible = false;
            $P.hide(); // no animation when loading page
            sizeMidPanes(_c[pane].dir == "horz" ? "all" : "center");
            if (state.initialized || o.triggerEventsOnLoad)
                _execCallback(pane, o.onhide_end || o.onhide);
        }
        else {
            s.isHiding = true; // used by onclose
            close(pane, false, noAnimation); // adjust all panes to fit
        }
    };
 
    var show = function (pane, openPane, noAnimation, noAlert) {
        var
            o    = options[pane]
        ,    s    = state[pane]
        ,    $P    = $Ps[pane]
        ,    $R    = $Rs[pane]
        ;
        if (!$P || !s.isHidden) return; // pane does not exist OR is not hidden
 
        // onshow_start callback - will CANCEL show if returns false
        if (false === _execCallback(pane, o.onshow_start)) return;
 
        s.isSliding = false; // just in case
        s.isShowing = true; // used by onopen/onclose
        //s.isHidden  = false; - will be set by open/close - if not cancelled
 
        // now show the elements
        //if ($R) $R.show(); - will be shown by open/close
        if (openPane === false)
            close(pane, true); // true = force
        else
            open(pane, false, noAnimation, noAlert); // adjust all panes to fit
    };
 
 
    var slideOpen = function (evt_or_pane) {
        var
            type = typeof evt_or_pane
        ,    pane = (type == "string" ? evt_or_pane : $(this).data("layoutEdge"))
        ;
        // prevent event from triggering on NEW resizer binding created below
        if (type == "object") { evt_or_pane.stopImmediatePropagation(); }
 
        if (state[pane].isClosed)
            open(pane, true); // true = slide - ie, called from here!
        else // skip 'open' if already open!
            bindStopSlidingEvents(pane, true); // BIND trigger events to close sliding-pane
    };
 
    var slideClosed = function (evt_or_pane) {
        var
            $E    = (typeof evt_or_pane == "string" ? $Ps[evt_or_pane] : $(this))
        ,    pane= $E.data("layoutEdge")
        ,    o    = options[pane]
        ,    s    = state[pane]
        ,    $P    = $Ps[pane]
        ;
        if (s.isClosed || s.isResizing)
            return; // skip if already closed OR in process of resizing
        else if (o.slideTrigger_close == "click")
            close_NOW(); // close immediately onClick
        else if (o.trackMouseWhenSliding && isMouseOver(pane))
            clearTimer(pane+"_closeSlider"); // browser glitch - mouse is REALLY 'over' the pane
        else // trigger = mouseout - use a delay
            setTimer(pane+"_closeSlider", close_NOW, 300); // .3 sec delay
 
        // SUBROUTINE for timed close
        function close_NOW (e) {
            if (s.isClosed) // skip 'close' if already closed!
                bindStopSlidingEvents(pane, false); // UNBIND trigger events
            else
                close(pane); // close will handle unbinding
        }
    };
 
 
    /**
     * toggle
     *
     * Toggles a pane open/closed by calling either open or close
     *
     * @param String  pane   The pane being toggled, ie: north, south, east, or west
     */
    var toggle = function (pane, slide) {
        if (typeof pane !="string")
            pane = $(this).data("layoutEdge"); // bound to $R.dblclick
        var s = state[pane];
        if (s.isHidden)
            show(pane); // will call 'open' after unhiding it
        else if (s.isClosed)
            open(pane, !!slide);
        else
            close(pane);
    };
 
    /**
     * close
     *
     * Close the specified pane (animation optional), and resize all other panes as needed
     *
     * @param String  pane   The pane being closed, ie: north, south, east, or west
     */
    var close = function (pane, force, noAnimation, skipCallback) {
        var
            $P        = $Ps[pane]
        ,    $R        = $Rs[pane]
        ,    $T        = $Ts[pane]
        ,    o        = options[pane]
        ,    s        = state[pane]
        ,    doFX    = !noAnimation && !s.isClosed && (o.fxName_close != "none")
        //     transfer logic vars to temp vars
        ,    isShowing    = s.isShowing
        ,    isHiding    = s.isHiding
        ,    wasSliding    = s.isSliding
        ;
        // now clear the logic vars
        delete s.isShowing;
        delete s.isHiding;
 
        if (!$P || !o.closable) return; // invalid request // (!o.resizable && !o.closable) ???
        else if (!force && s.isClosed && !isShowing) return; // already closed
 
        if (_c.isLayoutBusy) { // layout is 'busy' - probably with an animation
            _queue("close", pane, force); // set a callback for this action, if possible
            return; // ABORT 
        }
 
        // onclose_start callback - will CANCEL hide if returns false
        // SKIP if just 'showing' a hidden pane as 'closed'
        if (state.initialized && !isShowing && false === _execCallback(pane, o.onclose_start)) return;
 
        // SET flow-control flags
        _c[pane].isMoving = true;
        _c.isLayoutBusy = true;
 
        s.isClosed = true;
        s.isVisible = false;
        // update isHidden BEFORE sizing panes
        if (isHiding) s.isHidden = true;
        else if (isShowing) s.isHidden = false;
 
        if (s.isSliding) // pane is being closed, so UNBIND trigger events
            bindStopSlidingEvents(pane, false); // will set isSliding=false
        else if (state.initialized) // resize panes adjacent to this one
            sizeMidPanes(_c[pane].dir == "horz" ? "all" : "center", false); // false = NOT skipCallback
 
        // if this pane has a resizer bar, move it NOW - before animation
        if (state.initialized) setAsClosed(pane); // during init, setAsClosed will be called LATER by initHandles
 
        // ANIMATE 'CLOSE' - if no animation, then was ALREADY shown above
        if (doFX) {
            lockPaneForFX(pane, true); // need to set left/top so animation will work
            $P.hide( o.fxName_close, o.fxSettings_close, o.fxSpeed_close, function () {
                lockPaneForFX(pane, false); // undo
                close_2();
            });
        }
        else {
            $P.hide(); // just hide pane NOW
            close_2();
        };
 
        // SUBROUTINE
        function close_2 () {
            if (s.isClosed) { // make sure pane was not 'reopened' before animation finished!
 
                bindStartSlidingEvent(pane, true); // will enable if o.slidable = true
 
                // if opposite-pane was autoClosed, see if it can be autoOpened now
                var altPane = _c.altSide[pane];
                if (state[ altPane ].noRoom) {
                    setSizeLimits( altPane );
                    makePaneFit( altPane );
                }
 
                if (!skipCallback && (state.initialized || o.triggerEventsOnLoad)) {
                    // onclose callback - UNLESS just 'showing' a hidden pane as 'closed'
                    if (!isShowing && !wasSliding) _execCallback(pane, o.onclose_end || o.onclose);
                    // onhide OR onshow callback
                    if (isShowing)    _execCallback(pane, o.onshow_end || o.onshow);
                    if (isHiding)    _execCallback(pane, o.onhide_end || o.onhide);
                }
            }
            // execute internal flow-control callback
            _dequeue(pane);
        }
    };
 
    var setAsClosed = function (pane) {
        var
            $P        = $Ps[pane]
        ,    $R        = $Rs[pane]
        ,    $T        = $Ts[pane]
        ,    o        = options[pane]
        ,    s        = state[pane]
        ,    side    = _c[pane].side.toLowerCase()
        ,    inset    = "inset"+ _c[pane].side
        ,    rClass    = o.resizerClass
        ,    tClass    = o.togglerClass
        ,    _pane    = "-"+ pane // used for classNames
        ,    _open    = "-open"
        ,    _sliding= "-sliding"
        ,    _closed    = "-closed"
        ;
        $R
            .css(side, sC[inset]) // move the resizer
            .removeClass( rClass+_open +" "+ rClass+_pane+_open )
            .removeClass( rClass+_sliding +" "+ rClass+_pane+_sliding )
            .addClass( rClass+_closed +" "+ rClass+_pane+_closed )
            .unbind("dblclick."+ sID)
        ;
        // DISABLE 'resizing' when closed - do this BEFORE bindStartSlidingEvent?
        if (o.resizable && typeof $.fn.draggable == "function")
            $R
                .draggable("disable")
                .removeClass("ui-state-disabled") // do NOT apply disabled styling - not suitable here
                .css("cursor", "default")
                .attr("title","")
            ;
 
        // if pane has a toggler button, adjust that too
        if ($T) {
            $T
                .removeClass( tClass+_open +" "+ tClass+_pane+_open )
                .addClass( tClass+_closed +" "+ tClass+_pane+_closed )
                .attr("title", o.togglerTip_closed) // may be blank
            ;
            // toggler-content - if exists
            $T.children(".content-open").hide();
            $T.children(".content-closed").css("display","block");
        }
 
        // sync any 'pin buttons'
        syncPinBtns(pane, false);
 
        if (state.initialized) {
            // resize 'length' and position togglers for adjacent panes
            sizeHandles("all");
        }
    };
 
    /**
     * open
     *
     * Open the specified pane (animation optional), and resize all other panes as needed
     *
     * @param String  pane   The pane being opened, ie: north, south, east, or west
     */
    var open = function (pane, slide, noAnimation, noAlert) {
        var 
            $P        = $Ps[pane]
        ,    $R        = $Rs[pane]
        ,    $T        = $Ts[pane]
        ,    o        = options[pane]
        ,    s        = state[pane]
        ,    doFX    = !noAnimation && s.isClosed && (o.fxName_open != "none")
        //     transfer logic var to temp var
        ,    isShowing = s.isShowing
        ;
        // now clear the logic var
        delete s.isShowing;
 
        if (!$P || (!o.resizable && !o.closable)) return; // invalid request
        else if (s.isVisible && !s.isSliding) return; // already open
 
        // pane can ALSO be unhidden by just calling show(), so handle this scenario
        if (s.isHidden && !isShowing) {
            show(pane, true);
            return;
        }
 
        if (_c.isLayoutBusy) { // layout is 'busy' - probably with an animation
            _queue("open", pane, slide); // set a callback for this action, if possible
            return; // ABORT
        }
 
        // onopen_start callback - will CANCEL hide if returns false
        if (false === _execCallback(pane, o.onopen_start)) return;
 
        // make sure there is enough space available to open the pane
        setSizeLimits(pane, slide); // update pane-state
        if (s.minSize > s.maxSize) { // INSUFFICIENT ROOM FOR PANE TO OPEN!
            syncPinBtns(pane, false); // make sure pin-buttons are reset
            if (!noAlert && o.noRoomToOpenTip) alert(o.noRoomToOpenTip);
            return; // ABORT
        }
 
        // SET flow-control flags
        _c[pane].isMoving = true;
        _c.isLayoutBusy = true;
 
        if (slide) // START Sliding - will set isSliding=true
            bindStopSlidingEvents(pane, true); // BIND trigger events to close sliding-pane
        else if (s.isSliding) // PIN PANE (stop sliding) - open pane 'normally' instead
            bindStopSlidingEvents(pane, false); // UNBIND trigger events - will set isSliding=false
        else if (o.slidable)
            bindStartSlidingEvent(pane, false); // UNBIND trigger events
 
        s.noRoom = false; // will be reset by makePaneFit if 'noRoom'
        makePaneFit(pane);
 
        s.isVisible = true;
        s.isClosed    = false;
        // update isHidden BEFORE sizing panes - WHY??? Old?
        if (isShowing) s.isHidden = false;
 
        if (doFX) { // ANIMATE
            lockPaneForFX(pane, true); // need to set left/top so animation will work
            $P.show( o.fxName_open, o.fxSettings_open, o.fxSpeed_open, function() {
                lockPaneForFX(pane, false); // undo
                open_2(); // continue
            });
        }
        else {// no animation
            $P.show();    // just show pane and...
            open_2();    // continue
        };
 
        // SUBROUTINE
        function open_2 () {
            if (s.isVisible) { // make sure pane was not closed or hidden before animation finished!
 
                // cure iframe display issues
                _fixIframe(pane);
 
                // NOTE: if isSliding, then other panes are NOT 'resized'
                if (!s.isSliding) // resize all panes adjacent to this one
                    sizeMidPanes(_c[pane].dir=="vert" ? "center" : "all", false); // false = NOT skipCallback
                else if (o.slideTrigger_close == "mouseout" && isTimerRunning(pane+"_closeSlider")) {
                    if (o.trackMouseWhenSliding && isMouseOver(pane)) // handle Chrome browser glitch...
                        clearTimer(pane+"_closeSlider"); // prevent premature close
                }
 
                // set classes, position handles and execute callbacks...
                setAsOpen(pane);
            }
 
            // internal flow-control callback
            _dequeue(pane);
        };
    
    };
 
    var setAsOpen = function (pane, skipCallback) {
        var 
            $P        = $Ps[pane]
        ,    $R        = $Rs[pane]
        ,    $T        = $Ts[pane]
        ,    o        = options[pane]
        ,    s        = state[pane]
        ,    side    = _c[pane].side.toLowerCase()
        ,    inset    = "inset"+ _c[pane].side
        ,    rClass    = o.resizerClass
        ,    tClass    = o.togglerClass
        ,    _pane    = "-"+ pane // used for classNames
        ,    _open    = "-open"
        ,    _closed    = "-closed"
        ,    _sliding= "-sliding"
        ;
        $R
            .css(side, sC[inset] + getPaneSize(pane)) // move the resizer
            .removeClass( rClass+_closed +" "+ rClass+_pane+_closed )
            .addClass( rClass+_open +" "+ rClass+_pane+_open )
        ;
        if (s.isSliding)
            $R.addClass( rClass+_sliding +" "+ rClass+_pane+_sliding )
        else // in case 'was sliding'
            $R.removeClass( rClass+_sliding +" "+ rClass+_pane+_sliding )
 
        if (o.resizerDblClickToggle)
            $R.bind("dblclick", toggle );
        removeHover( 0, $R ); // remove hover classes
        if (o.resizable && typeof $.fn.draggable == "function")
            $R
                .draggable("enable")
                .css("cursor", o.resizerCursor)
                .attr("title", o.resizerTip)
            ;
        else if (!s.isSliding)
            $R.css("cursor", "default"); // n-resize, s-resize, etc
 
        // if pane also has a toggler button, adjust that too
        if ($T) {
            $T
                .removeClass( tClass+_closed +" "+ tClass+_pane+_closed )
                .addClass( tClass+_open +" "+ tClass+_pane+_open )
                .attr("title", o.togglerTip_open) // may be blank
            ;
            removeHover( 0, $T ); // remove hover classes
            // toggler-content - if exists
            $T.children(".content-closed").hide();
            $T.children(".content-open").css("display","block");
        }
 
        // sync any 'pin buttons'
        syncPinBtns(pane, !s.isSliding);
 
        if (state.initialized) {
            // resize resizer & toggler sizes for all panes
            sizeHandles("all");
            // resize content every time pane opens - to be sure
            sizeContent(pane);
        }
 
        // update pane-state dimensions
        $.extend(s, getElemDims($P));
 
        if (!skipCallback && (state.initialized || o.triggerEventsOnLoad) && $P.is(":visible")) {
            // onopen callback
            _execCallback(pane, o.onopen_end || o.onopen);
            // onshow callback - TODO: should this be here?
            if (s.isShowing) _execCallback(pane, o.onshow_end || o.onshow);
            // ALSO call onresize because layout-size *may* have changed while pane was closed
            if (state.initialized) _execCallback(pane, o.onresize_end || o.onresize); // if (state.initialized)
        }
    };
 
 
    /**
     * lockPaneForFX
     *
     * Must set left/top on East/South panes so animation will work properly
     *
     * @param String  pane  The pane to lock, 'east' or 'south' - any other is ignored!
     * @param Boolean  doLock  true = set left/top, false = remove
     */
    var lockPaneForFX = function (pane, doLock) {
        var $P = $Ps[pane];
        if (doLock) {
            $P.css({ zIndex: _c.zIndex.pane_animate }); // overlay all elements during animation
            if (pane=="south")
                $P.css({ top: sC.insetTop + sC.innerHeight - $P.outerHeight() });
            else if (pane=="east")
                $P.css({ left: sC.insetLeft + sC.innerWidth - $P.outerWidth() });
        }
        else { // animation DONE - RESET CSS
            $P.css({ zIndex: (state[pane].isSliding ? _c.zIndex.pane_sliding : _c.zIndex.pane_normal) });
            if (pane=="south")
                $P.css({ top: "auto" });
            else if (pane=="east")
                $P.css({ left: "auto" });
            // fix anti-aliasing in IE - only needed for animations that change opacity
            var o = options[pane];
            if (state.browser.msie && o.fxOpacityFix && o.fxName_open != "slide" && $P.css("filter") && $P.css("opacity") == 1)
                $P[0].style.removeAttribute('filter');
        }
    };
 
 
    /**
     * bindStartSlidingEvent
     *
     * Toggle sliding functionality of a specific pane on/off by adding removing 'slide open' trigger
     *
     * @callers  open(), close()
     * @param String  pane  The pane to enable/disable, 'north', 'south', etc.
     * @param Boolean  enable  Enable or Disable sliding?
     */
    var bindStartSlidingEvent = function (pane, enable) {
        var 
            o        = options[pane]
        ,    $R        = $Rs[pane]
        ,    trigger    = o.slideTrigger_open
        ;
        if (!$R || !o.slidable) return;
 
        // make sure we have a valid event
        if (trigger != "click" && trigger != "dblclick" && trigger != "mouseover")
            trigger = o.slideTrigger_open = "click";
 
        $R
            // add or remove trigger event
            [enable ? "bind" : "unbind"](trigger, slideOpen)
            // set the appropriate cursor & title/tip
            .css("cursor", (enable ? o.sliderCursor : "default"))
            .attr("title", (enable ? o.sliderTip : ""))
        ;
    };
 
    /**
     * bindStopSlidingEvents
     *
     * Add or remove 'mouseout' events to 'slide close' when pane is 'sliding' open or closed
     * Also increases zIndex when pane is sliding open
     * See bindStartSlidingEvent for code to control 'slide open'
     *
     * @callers  slideOpen(), slideClosed()
     * @param String  pane  The pane to process, 'north', 'south', etc.
     * @param Boolean  enable  Enable or Disable events?
     */
    var bindStopSlidingEvents = function (pane, enable) {
        var 
            o        = options[pane]
        ,    s        = state[pane]
        ,    trigger    = o.slideTrigger_close
        ,    action    = (enable ? "bind" : "unbind") // can't make 'unbind' work! - see disabled code below
        ,    $P        = $Ps[pane]
        ,    $R        = $Rs[pane]
        ;
 
        s.isSliding = enable; // logic
        clearTimer(pane+"_closeSlider"); // just in case
 
        // raise z-index when sliding
        $P.css({ zIndex: (enable ? _c.zIndex.pane_sliding : _c.zIndex.pane_normal) });
        $R.css({ zIndex: (enable ? _c.zIndex.pane_sliding : _c.zIndex.resizer_normal) });
 
        // make sure we have a valid event
        if (trigger != "mouseout" && trigger != "click")
            trigger = o.slideTrigger_close = "mouseout";
 
        // remove 'slideOpen' trigger event from resizer
        if (enable) bindStartSlidingEvent(pane, false);
 
        // add/remove slide triggers
        $R[action](trigger, slideClosed); // base event on resize
        // need extra events for mouseout
        if (trigger == "mouseout") {
            // also close on pane.mouseout
            $P[action]("mouseout."+ sID, slideClosed);
            // cancel timer when mouse moves between 'pane' and 'resizer'
            $R[action]("mouseover", cancelMouseOut);
            $P[action]("mouseover."+ sID, cancelMouseOut);
        }
 
        if (!enable)
            clearTimer(pane+"_closeSlider");
        else if (trigger == "click" && !o.resizable) {
            // IF pane is not resizable (which already has a cursor and tip) 
            // then set the a cursor & title/tip on resizer when sliding
            $R.css("cursor", (enable ? o.sliderCursor : "default"));
            $R.attr("title", (enable ? o.togglerTip_open : "")); // use Toggler-tip, eg: "Close Pane"
        }
 
        // SUBROUTINE for mouseout timer clearing
        function cancelMouseOut (evt) {
            clearTimer(pane+"_closeSlider");
            evt.stopPropagation();
        }
    };
 
 
    /**
     * makePaneFit
     *
     * Hides/closes a pane if there is insufficient room - reverses this when there is room again
     * MUST have already called setSizeLimits() before calling this method
     */
    var makePaneFit = function (pane, isOpening, skipCallback) {
        var
            o    = options[pane]
        ,    s    = state[pane]
        ,    c    = _c[pane]
        ,    $P    = $Ps[pane]
        ,    $R    = $Rs[pane]
        ,    isSidePane     = c.dir=="vert"
        ,    hasRoom        = false
        ;
 
        // special handling for center pane
        if (pane == "center" || (isSidePane && s.noVerticalRoom)) {
            // see if there is enough room to display the center-pane
            hasRoom = s.minHeight <= s.maxHeight && (isSidePane || s.minWidth <= s.maxWidth);
            if (hasRoom && s.noRoom) { // previously hidden due to noRoom, so show now
                $P.show();
                if ($R) $R.show();
                s.isVisible = true;
                s.noRoom = false;
                if (isSidePane) s.noVerticalRoom = false;
                _fixIframe(pane);
            }
            else if (!hasRoom && !s.noRoom) { // not currently hidden, so hide now
                $P.hide();
                if ($R) $R.hide();
                s.isVisible = false;
                s.noRoom = true;
            }
        }
 
        // see if there is enough room to fit the border-pane
        if (pane == "center") {
            // ignore center in this block
        }
        else if (s.minSize <= s.maxSize) { // pane CAN fit
            hasRoom = true;
            if (s.size > s.maxSize) // pane is too big - shrink it
                sizePane(pane, s.maxSize, skipCallback);
            else if (s.size < s.minSize) // pane is too small - enlarge it
                sizePane(pane, s.minSize, skipCallback);
            else if ($R && $P.is(":visible")) {
                // make sure resizer-bar is positioned correctly
                // handles situation where nested layout was 'hidden' when initialized
                var
                    side = c.side.toLowerCase()
                ,    pos  = s.size + sC["inset"+ c.side]
                ;
                if (_cssNum($R, side) != pos) $R.css( side, pos );
            }
 
            // if was previously hidden due to noRoom, then RESET because NOW there is room
            if (s.noRoom) {
                // s.noRoom state will be set by open or show
                if (s.wasOpen && o.closable) {
                    if (o.autoReopen)
                        open(pane, false, true, true); // true = noAnimation, true = noAlert
                    else // leave the pane closed, so just update state
                        s.noRoom = false;
                }
                else
                    show(pane, s.wasOpen, true, true); // true = noAnimation, true = noAlert
            }
        }
        else { // !hasRoom - pane CANNOT fit
            if (!s.noRoom) { // pane not set as noRoom yet, so hide or close it now...
                s.noRoom = true; // update state
                s.wasOpen = !s.isClosed && !s.isSliding;
                if (o.closable) // 'close' if possible
                    close(pane, true, true); // true = force, true = noAnimation
                else // 'hide' pane if cannot just be closed
                    hide(pane, true); // true = noAnimation
            }
        }
    };
 
 
    /**
     * sizePane / manualSizePane
     *
     * sizePane is called only by internal methods whenever a pane needs to be resized
     * manualSizePane is an exposed flow-through method allowing extra code when pane is 'manually resized'
     *
     * @param String    pane    The pane being resized
     * @param Integer    size    The *desired* new size for this pane - will be validated
     * @param Boolean    skipCallback    Should the onresize callback be run?
     */
    var manualSizePane = function (pane, size, skipCallback) {
        // ANY call to sizePane will disabled autoResize
        var
            o = options[pane]
        //    if resizing callbacks have been delayed and resizing is now DONE, force resizing to complete...
        ,    forceResize = o.resizeWhileDragging && !_c.isLayoutBusy //  && !o.triggerEventsWhileDragging
        ;
        o.autoResize = false;
        // flow-through...
        sizePane(pane, size, skipCallback, forceResize);
    }
    var sizePane = function (pane, size, skipCallback, force) {
        var 
            o        = options[pane]
        ,    s        = state[pane]
        ,    $P        = $Ps[pane]
        ,    $R        = $Rs[pane]
        ,    side    = _c[pane].side.toLowerCase()
        ,    inset    = "inset"+ _c[pane].side
        ,    skipResizeWhileDragging = _c.isLayoutBusy && !o.triggerEventsWhileDragging
        ,    oldSize
        ;
        // calculate 'current' min/max sizes
        setSizeLimits(pane); // update pane-state
        oldSize = s.size;
 
        size = _parseSize(pane, size); // handle percentages & auto
        size = max(size, _parseSize(pane, o.minSize));
        size = min(size, s.maxSize);
        if (size < s.minSize) { // not enough room for pane!
            makePaneFit(pane, false, skipCallback);    // will hide or close pane
            return;
        }
 
        // IF newSize is same as oldSize, then nothing to do - abort
        if (!force && size == oldSize) return;
        s.size = size;
 
        // resize the pane, and make sure its visible
        $P.css( _c[pane].sizeType.toLowerCase(), max(1, cssSize(pane, size)) );
 
        // update pane-state dimensions
        $.extend(s, getElemDims($P));
 
        // reposition the resizer-bar
        if ($R && $P.is(":visible")) $R.css( side, size + sC[inset] );
 
        // resize all the adjacent panes, and adjust their toggler buttons
        // when skipCallback passed, it means the controlling method will handle 'other panes'
        if (!skipCallback) {
            // also no callback if live-resize is in progress and NOT triggerEventsWhileDragging
            if (!s.isSliding) sizeMidPanes(_c[pane].dir=="horz" ? "all" : "center", skipResizeWhileDragging, force);
            sizeHandles("all");
        }
 
        sizeContent(pane);
 
        if (!skipCallback && !skipResizeWhileDragging && state.initialized && s.isVisible)
            _execCallback(pane, o.onresize_end || o.onresize);
 
        // if opposite-pane was autoClosed, see if it can be autoOpened now
        var altPane = _c.altSide[pane];
        if (size < oldSize && state[ altPane ].noRoom) {
            setSizeLimits( altPane );
            makePaneFit( altPane, false, skipCallback );
        }
    };
 
    /**
     * sizeMidPanes
     *
     * @callers  initPanes(), sizePane(), resizeAll(), open(), close(), hide()
     */
    var sizeMidPanes = function (panes, skipCallback, force) {
        if (!panes || panes == "all") panes = "east,west,center";
 
        $.each(panes.split(","), function (i, pane) {
            if (!$Ps[pane]) return; // NO PANE - skip
            var 
                o        = options[pane]
            ,    s        = state[pane]
            ,    $P        = $Ps[pane]
            ,    $R        = $Rs[pane]
            ,    isCenter= (pane=="center")
            ,    hasRoom    = true
            ,    CSS        = {}
            ,    d        = calcNewCenterPaneDims()
            ;
            // update pane-state dimensions
            $.extend(s, getElemDims($P));
 
            if (pane == "center") {
                if (!force && s.isVisible && d.width == s.outerWidth && d.height == s.outerHeight)
                    return true; // SKIP - pane already the correct size
                // set state for makePaneFit() logic
                $.extend(s, cssMinDims(pane), {
                    maxWidth:        d.width
                ,    maxHeight:        d.height
                });
                CSS = d;
                // convert OUTER width/height to CSS width/height 
                CSS.width    = cssW(pane, d.width);
                CSS.height    = cssH(pane, d.height);
                hasRoom        = CSS.width > 0 && CSS.height > 0;
            }
            else { // for east and west, set only the height, which is same as center height
                // set state.min/maxWidth/Height for makePaneFit() logic
                $.extend(s, getElemDims($P), cssMinDims(pane))
                if (!force && !s.noVerticalRoom && d.height == s.outerHeight)
                    return true; // SKIP - pane already the correct size
                CSS.top            = d.top;
                CSS.bottom        = d.bottom;
                CSS.height        = cssH(pane, d.height);
                s.maxHeight    = max(0, CSS.height);
                hasRoom            = (s.maxHeight > 0);
                if (!hasRoom) s.noVerticalRoom = true; // makePaneFit() logic
            }
 
            if (hasRoom) {
                $P.css(CSS); // apply the CSS to pane
                if (pane == "center") $.extend(s, getElemDims($P)); // set new dimensions
                if (s.noRoom) makePaneFit(pane); // will re-open/show auto-closed/hidden pane
                if (state.initialized) sizeContent(pane);
            }
            else if (!s.noRoom && s.isVisible) // no room for pane
                makePaneFit(pane); // will hide or close pane
 
            /*
             * Extra CSS for IE6 or IE7 in Quirks-mode - add 'width' to NORTH/SOUTH panes
             * Normally these panes have only 'left' & 'right' positions so pane auto-sizes
             * ALSO required when pane is an IFRAME because will NOT default to 'full width'
             */
            if (pane == "center") { // finished processing midPanes
                var b = state.browser;
                var fix = b.isIE6 || (b.msie && !b.boxModel);
                if ($Ps.north && (fix || state.north.tagName=="IFRAME")) 
                    $Ps.north.css("width", cssW($Ps.north, sC.innerWidth));
                if ($Ps.south && (fix || state.south.tagName=="IFRAME"))
                    $Ps.south.css("width", cssW($Ps.south, sC.innerWidth));
            }
 
            // resizeAll passes skipCallback because it triggers callbacks after ALL panes are resized
            if (!skipCallback && state.initialized && s.isVisible)
                _execCallback(pane, o.onresize_end || o.onresize);
        });
    };
 
 
    /**
     * resizeAll
     *
     * @callers  window.onresize(), callbacks or custom code
     */
    var resizeAll = function () {
        var
            oldW    = sC.innerWidth
        ,    oldH    = sC.innerHeight
        ;
        $.extend( state.container, getElemDims( $Container ) ); // UPDATE container dimensions
        if (!sC.outerHeight) return; // cannot size layout when 'container' is hidden or collapsed
 
        // onresizeall_start will CANCEL resizing if returns false
        // state.container has already been set, so user can access this info for calcuations
        if (false === _execCallback(null, options.onresizeall_start)) return false;
 
        var
            // see if container is now 'smaller' than before
            shrunkH    = (sC.innerHeight < oldH)
        ,    shrunkW    = (sC.innerWidth < oldW)
        ,    o, s, dir
        ;
        // NOTE special order for sizing: S-N-E-W
        $.each(["south","north","east","west"], function (i, pane) {
            if (!$Ps[pane]) return; // no pane - SKIP
            s    = state[pane];
            o    = options[pane];
            dir    = _c[pane].dir;
 
            if (o.autoResize && s.size != o.size) // resize pane to original size set in options
                sizePane(pane, o.size, true); // true - skipCallback
            else {
                setSizeLimits(pane);
                makePaneFit(pane, false, true); // true - skipCallback
            }
        });
 
        sizeMidPanes("all", true); // true - skipCallback
        sizeHandles("all"); // reposition the toggler elements
 
        // trigger all individual pane callbacks AFTER layout has finished resizing
        o = options; // reuse alias
        $.each(_c.allPanes.split(","), function (i, pane) {
            if (state[pane].isVisible) // undefined for non-existent panes
                _execCallback(pane, o[pane].onresize_end || o[pane].onresize); // callback - if exists
        });
 
        _execCallback(null, o.onresizeall_end || o.onresizeall); // onresizeall callback, if exists
    };
 
 
    /**
     * sizeContent
     *
     * IF pane has a content-div, then resize all elements inside pane to fit pane-height
     */
    var sizeContent = function (panes) {
        if (!panes || panes == "all") panes = _c.allPanes;
        $.each(panes.split(","), function (idx, pane) {
            var 
                $P    = $Ps[pane]
            ,    $C    = $Cs[pane]
            ,    o    = options[pane]
            ,    s    = state[pane]
            ,    m    = s.content
            ;
            if ($P && $C && $P.is(":visible")) { // if No Content OR Pane not visible, then skip
                var eC = $C[0];
                function setOffsets () {
                    $.swap( $C[0], { height: "auto", display: "block", visibility: "hidden" }, function(){
                        m.above = eC.offsetTop;
                        m.below = $P.innerHeight() - eC.offsetTop - eC.offsetHeight;
                    });
                };
                // defer remeasuring offsets while live-resizing
                if (o.resizeContentWhileDragging || !s.isResizing || m.above == undefined) 
                    // let pane size-to-fit (invisibly), then measure the Content offset from top & bottom
                    $.swap( $P[0], { position: "relative", height: "auto", visibility: "hidden" }, setOffsets );
                // resize the Content element to fit actual pane-size -  will autoHide if not enough room
                setOuterHeight($C, $P.innerHeight() - m.above - m.below, true); // true=autoHide
            }
        });
    };
 
 
    /**
     * sizeHandles
     *
     * Called every time a pane is opened, closed, or resized to slide the togglers to 'center' and adjust their length if necessary
     *
     * @callers  initHandles(), open(), close(), resizeAll()
     */
    var sizeHandles = function (panes) {
        if (!panes || panes == "all") panes = _c.borderPanes;
 
        $.each(panes.split(","), function (i, pane) {
            var 
                o    = options[pane]
            ,    s    = state[pane]
            ,    $P    = $Ps[pane]
            ,    $R    = $Rs[pane]
            ,    $T    = $Ts[pane]
            ,    $TC
            ;
            if (!$P || !$R) return;
 
            var
                dir            = _c[pane].dir
            ,    _state        = (s.isClosed ? "_closed" : "_open")
            ,    spacing        = o["spacing"+ _state]
            ,    togAlign    = o["togglerAlign"+ _state]
            ,    togLen        = o["togglerLength"+ _state]
            ,    paneLen
            ,    offset
            ,    CSS = {}
            ;
 
            if (spacing == 0) {
                $R.hide();
                return;
            }
            else if (!s.noRoom && !s.isHidden) // skip if resizer was hidden for any reason
                $R.show(); // in case was previously hidden
 
            // Resizer Bar is ALWAYS same width/height of pane it is attached to
            if (dir == "horz") { // north/south
                paneLen = $P.outerWidth(); // s.outerWidth || 
                s.resizerLength = paneLen;
                $R.css({
                    width:    max(1, cssW($R, paneLen)) // account for borders & padding
                ,    height:    max(0, cssH($R, spacing)) // ditto
                ,    left:    _cssNum($P, "left")
                });
            }
            else { // east/west
                paneLen = $P.outerHeight(); // s.outerHeight || 
                s.resizerLength = paneLen;
                $R.css({
                    height:    max(1, cssH($R, paneLen)) // account for borders & padding
                ,    width:    max(0, cssW($R, spacing)) // ditto
                ,    top:    sC.insetTop + getPaneSize("north", true) // TODO: what if no North pane?
                //,    top:    _cssNum($Ps["center"], "top")
                });
            }
 
            // remove hover classes
            removeHover( o, $R );
 
            if ($T) {
                if (togLen == 0 || (s.isSliding && o.hideTogglerOnSlide)) {
                    $T.hide(); // always HIDE the toggler when 'sliding'
                    return;
                }
                else
                    $T.show(); // in case was previously hidden
 
                if (!(togLen > 0) || togLen == "100%" || togLen > paneLen) {
                    togLen = paneLen;
                    offset = 0;
                }
                else { // calculate 'offset' based on options.PANE.togglerAlign_open/closed
                    if (typeof togAlign == "string") {
                        switch (togAlign) {
                            case "top":
                            case "left":    offset = 0;
                                            break;
                            case "bottom":
                            case "right":    offset = paneLen - togLen;
                                            break;
                            case "middle":
                            case "center":
                            default:        offset = Math.floor((paneLen - togLen) / 2); // 'default' catches typos
                        }
                    }
                    else { // togAlign = number
                        var x = parseInt(togAlign); //
                        if (togAlign >= 0) offset = x;
                        else offset = paneLen - togLen + x; // NOTE: x is negative!
                    }
                }
 
                if (dir == "horz") { // north/south
                    var width = cssW($T, togLen);
                    $T.css({
                        width:    max(0, width)  // account for borders & padding
                    ,    height:    max(1, cssH($T, spacing)) // ditto
                    ,    left:    offset // TODO: VERIFY that toggler  positions correctly for ALL values
                    ,    top:    0
                    });
                    // CENTER the toggler content SPAN
                    $T.children(".content").each(function(){
                        $TC = $(this);
                        $TC.css("marginLeft", Math.floor((width-$TC.outerWidth())/2)); // could be negative
                    });
                }
                else { // east/west
                    var height = cssH($T, togLen);
                    $T.css({
                        height:    max(0, height)  // account for borders & padding
                    ,    width:    max(1, cssW($T, spacing)) // ditto
                    ,    top:    offset // POSITION the toggler
                    ,    left:    0
                    });
                    // CENTER the toggler content SPAN
                    $T.children(".content").each(function(){
                        $TC = $(this);
                        $TC.css("marginTop", Math.floor((height-$TC.outerHeight())/2)); // could be negative
                    });
                }
 
                // remove ALL hover classes
                removeHover( 0, $T );
            }
 
            // DONE measuring and sizing this resizer/toggler, so can be 'hidden' now
            if (!state.initialized && o.initHidden) {
                $R.hide();
                if ($T) $T.hide();
            }
        });
    };
 
 
    /**
     *    swapPanes
     *
     *    Move a pane from source-side (eg, west) to target-side (eg, east)
     *    If pane exists on target-side, move that to source-side, ie, 'swap' the panes
     */
    var swapPanes = function (pane1, pane2) {
        var
            oPane1    = copy( pane1 )
        ,    oPane2    = copy( pane2 )
        ,    sizes    = {}
        ;
        sizes[pane1] = oPane1 ? oPane1.state.size : 0;
        sizes[pane2] = oPane2 ? oPane2.state.size : 0;
 
        // clear pointers & state
        $Ps[pane1] = false; 
        $Ps[pane2] = false;
        state[pane1] = {};
        state[pane2] = {};
        
        // transfer element pointers and data to NEW Layout keys
        move( oPane1, pane2 );
        move( oPane2, pane1 );
 
        // cleanup objects
        oPane1 = oPane2 = sizes = null;
 
        // pane1 does not exist anymore
        if (!$Ps[pane1] && $Rs[pane1]) {
            $Rs[pane1].remove();
            $Rs[pane1] = $Ts[pane1] = false;
        }
 
        // pane2 does not exist anymore
        if (!$Ps[pane2] && $Rs[pane2]) {
            $Rs[pane2].remove();
            $Rs[pane2] = $Ts[pane2] = false;
        }
 
        // make panes 'visible' again
        if ($Ps[pane1]) $Ps[pane1].css(_c.visible);
        if ($Ps[pane2]) $Ps[pane2].css(_c.visible);
 
        // fix any size discrepancies caused by swap
        resizeAll();
 
        return;
 
        function copy (n) { // n = pane
            var
                $P    = $Ps[n]
            ,    $C    = $Cs[n]
            ;
            return !$P ? false : {
                pane:        n
            ,    P:            $P ? $P[0] : false
            ,    C:            $C ? $C[0] : false
            ,    state:        $.extend({}, state[n])
            ,    options:    $.extend({}, options[n])
            }
        };
 
        function move (oPane, pane) {
            if (!oPane) return;
            var
                P        = oPane.P
            ,    C        = oPane.C
            ,    oldPane = oPane.pane
            ,    c        = _c[pane]
            ,    side    = c.side.toLowerCase()
            ,    inset    = "inset"+ c.side
            //    save pane-options that should be retained
            ,    s        = $.extend({}, state[pane])
            ,    o        = options[pane]
            //    RETAIN side-specific FX Settings - more below
            ,    fx        = { resizerCursor: o.resizerCursor }
            ,    re, size, pos
            ;
            $.each("fxName,fxSpeed,fxSettings".split(","), function (i, k) {
                fx[k] = o[k];
                fx[k +"_open"]  = o[k +"_open"];
                fx[k +"_close"] = o[k +"_close"];
            });
 
            // update object pointers and attributes
            $Ps[pane] = $(P)
                .data("layoutEdge", pane)
                .css(_c.hidden)
                .css(c.cssReq)
            ;
            $Cs[pane] = C ? $(C) : false;
 
            // set options and state
            options[pane]    = $.extend({}, oPane.options, fx);
            state[pane]        = $.extend({}, oPane.state);
 
            // change classNames on the pane, eg: ui-layout-pane-east ==> ui-layout-pane-west
            re = new RegExp("pane-"+ oldPane, "g");
            P.className = P.className.replace(re, "pane-"+ pane);
 
            if (!$Rs[pane]) {
                initHandles(pane); // create the required resizer & toggler
                initResizable(pane);
            }
 
            // if moving to different orientation, then keep 'target' pane size
            if (c.dir != _c[oldPane].dir) {
                size = sizes[pane] || 0;
                setSizeLimits(pane); // update pane-state
                size = max(size, state[pane].minSize);
                // use manualSizePane to disable autoResize - not useful after panes are swapped
                manualSizePane(pane, size, true); // true = skipCallback
            }
            else // move the resizer here
                $Rs[pane].css(side, sC[inset] + (state[pane].isVisible ? getPaneSize(pane) : 0));
 
 
            // ADD CLASSNAMES & SLIDE-BINDINGS
            if (oPane.state.isVisible && !s.isVisible)
                setAsOpen(pane, true); // true = skipCallback
            else {
                setAsClosed(pane, true); // true = skipCallback
                bindStartSlidingEvent(pane, true); // will enable events IF option is set
            }
 
            // DESTROY the object
            oPane = null;
        };
    };
 
 
    /**
     * keyDown
     *
     * Capture keys when enableCursorHotkey - toggle pane if hotkey pressed
     *
     * @callers  document.keydown()
     */
    function keyDown (evt) {
        if (!evt) return true;
        var code = evt.keyCode;
        if (code < 33) return true; // ignore special keys: ENTER, TAB, etc
 
        var
            PANE = {
                38: "north" // Up Cursor    - $.ui.keyCode.UP
            ,    40: "south" // Down Cursor    - $.ui.keyCode.DOWN
            ,    37: "west"  // Left Cursor    - $.ui.keyCode.LEFT
            ,    39: "east"  // Right Cursor    - $.ui.keyCode.RIGHT
            }
        ,    ALT        = evt.altKey // no worky!
        ,    SHIFT    = evt.shiftKey
        ,    CTRL    = evt.ctrlKey
        ,    CURSOR    = (CTRL && code >= 37 && code <= 40)
        ,    o, k, m, pane
        ;
 
        if (CURSOR && options[PANE[code]].enableCursorHotkey) // valid cursor-hotkey
            pane = PANE[code];
        else if (CTRL || SHIFT) // check to see if this matches a custom-hotkey
            $.each(_c.borderPanes.split(","), function (i, p) { // loop each pane to check its hotkey
                o = options[p];
                k = o.customHotkey;
                m = o.customHotkeyModifier; // if missing or invalid, treated as "CTRL+SHIFT"
                if ((SHIFT && m=="SHIFT") || (CTRL && m=="CTRL") || (CTRL && SHIFT)) { // Modifier matches
                    if (k && code == (isNaN(k) || k <= 9 ? k.toUpperCase().charCodeAt(0) : k)) { // Key matches
                        pane = p;
                        return false; // BREAK
                    }
                }
            });
 
        // validate pane
        if (!pane || !$Ps[pane] || !options[pane].closable || state[pane].isHidden)
            return true;
 
        toggle(pane);
 
        evt.stopPropagation();
        evt.returnValue = false; // CANCEL key
        return false;
    };
 
 
/*
 * ######################################
 *      UTILITY METHODS
 *   called externally or by initButtons
 * ######################################
 */
 
    /**
    * allowOverflow / resetOverflow
    *
    * Change/reset a pane's overflow setting & zIndex to allow popups/drop-downs to work
    *
    * @param element   elem     Optional - can also be 'bound' to a click, mouseOver, or other event
    */
    function allowOverflow (el) {
        if (this && this.tagName) el = this; // BOUND to element
        var $P;
        if (typeof el == "string")
            $P = $Ps[el];
        else if ($(el).data("layoutRole"))
            $P = $(el);
        else
            $(el).parents.each(function(){
                if ($(this).data("layoutRole")) {
                    $P = $(this);
                    return false; // BREAK
                }
            });
        if (!$P || !$P.length) return; // INVALID
 
        var
            pane    = $P.data("layoutEdge")
        ,    s        = state[pane]
        ;
 
        // if pane is already raised, then reset it before doing it again!
        // this would happen if allowOverflow is attached to BOTH the pane and an element 
        if (s.cssSaved)
            resetOverflow(pane); // reset previous CSS before continuing
 
        // if pane is raised by sliding or resizing, or it's closed, then abort
        if (s.isSliding || s.isResizing || s.isClosed) {
            s.cssSaved = false;
            return;
        }
 
        var
            newCSS    = { zIndex: (_c.zIndex.pane_normal + 1) }
        ,    curCSS    = {}
        ,    of        = $P.css("overflow")
        ,    ofX        = $P.css("overflowX")
        ,    ofY        = $P.css("overflowY")
        ;
        // determine which, if any, overflow settings need to be changed
        if (of != "visible") {
            curCSS.overflow = of;
            newCSS.overflow = "visible";
        }
        if (ofX && ofX != "visible" && ofX != "auto") {
            curCSS.overflowX = ofX;
            newCSS.overflowX = "visible";
        }
        if (ofY && ofY != "visible" && ofY != "auto") {
            curCSS.overflowY = ofX;
            newCSS.overflowY = "visible";
        }
 
        // save the current overflow settings - even if blank!
        s.cssSaved = curCSS;
 
        // apply new CSS to raise zIndex and, if necessary, make overflow 'visible'
        $P.css( newCSS );
 
        // make sure the zIndex of all other panes is normal
        $.each(_c.allPanes.split(","), function(i, p) {
            if (p != pane) resetOverflow(p);
        });
 
    };
 
    function resetOverflow (el) {
        if (this && this.tagName) el = this; // BOUND to element
        var $P;
        if (typeof el == "string")
            $P = $Ps[el];
        else if ($(el).data("layoutRole"))
            $P = $(el);
        else
            $(el).parents.each(function(){
                if ($(this).data("layoutRole")) {
                    $P = $(this);
                    return false; // BREAK
                }
            });
        if (!$P || !$P.length) return; // INVALID
 
        var
            pane    = $P.data("layoutEdge")
        ,    s        = state[pane]
        ,    CSS        = s.cssSaved || {}
        ;
        // reset the zIndex
        if (!s.isSliding && !s.isResizing)
            $P.css("zIndex", _c.zIndex.pane_normal);
 
        // reset Overflow - if necessary
        $P.css( CSS );
 
        // clear var
        s.cssSaved = false;
    };
 
 
    /**
    * getBtn
    *
    * Helper function to validate params received by addButton utilities
    *
    * Two classes are added to the element, based on the buttonClass...
    * The type of button is appended to create the 2nd className:
    *  - ui-layout-button-pin
    *  - ui-layout-pane-button-toggle
    *  - ui-layout-pane-button-open
    *  - ui-layout-pane-button-close
    *
    * @param String   selector     jQuery selector for button, eg: ".ui-layout-north .toggle-button"
    * @param String   pane         Name of the pane the button is for: 'north', 'south', etc.
    * @returns  If both params valid, the element matching 'selector' in a jQuery wrapper - otherwise 'false'
    */
    function getBtn(selector, pane, action) {
        var $E    = $(selector);
        if (!$E.length) // element not found
            alert(lang.errButton + lang.selector +": "+ selector);
        else if (_c.borderPanes.indexOf(pane) == -1) // invalid 'pane' sepecified
            alert(lang.errButton + lang.Pane.toLowerCase() +": "+ pane);
        else { // VALID
            var btn = options[pane].buttonClass +"-"+ action;
            $E
                .addClass( btn +" "+ btn +"-"+ pane )
                .data("layoutName", options.name) // add layout identifier - even if blank!
            ;
            return $E;
        }
        return false;  // INVALID
    };
 
 
    /**
    * bindButton
    *
    * NEW syntax for binding layout-buttons - will eventually replace addToggleBtn, addOpenBtn, etc.
    *
    */
    function bindButton (selector, action, pane) {
        switch (action.toLowerCase()) {
            case "toggle":            addToggleBtn(selector, pane);        break;    
            case "open":            addOpenBtn(selector, pane);            break;
            case "close":            addCloseBtn(selector, pane);        break;
            case "pin":                addPinBtn(selector, pane);            break;
            case "toggle-slide":    addToggleBtn(selector, pane, true);    break;    
            case "open-slide":        addOpenBtn(selector, pane, true);    break;
        }
    };
 
    /**
    * addToggleBtn
    *
    * Add a custom Toggler button for a pane
    *
    * @param String   selector     jQuery selector for button, eg: ".ui-layout-north .toggle-button"
    * @param String   pane         Name of the pane the button is for: 'north', 'south', etc.
    */
    function addToggleBtn (selector, pane, slide) {
        var $E = getBtn(selector, pane, "toggle");
        if ($E)
            $E.click(function (evt) {
                toggle(pane, !!slide);
                evt.stopPropagation();
            });
    };
 
    /**
    * addOpenBtn
    *
    * Add a custom Open button for a pane
    *
    * @param String   selector     jQuery selector for button, eg: ".ui-layout-north .open-button"
    * @param String   pane         Name of the pane the button is for: 'north', 'south', etc.
    */
    function addOpenBtn (selector, pane, slide) {
        var $E = getBtn(selector, pane, "open");
        if ($E)
            $E
                .attr("title", lang.Open)
                .click(function (evt) {
                    open(pane, !!slide);
                    evt.stopPropagation();
                })
            ;
    };
 
    /**
    * addCloseBtn
    *
    * Add a custom Close button for a pane
    *
    * @param String   selector     jQuery selector for button, eg: ".ui-layout-north .close-button"
    * @param String   pane         Name of the pane the button is for: 'north', 'south', etc.
    */
    function addCloseBtn (selector, pane) {
        var $E = getBtn(selector, pane, "close");
        if ($E)
            $E
                .attr("title", lang.Close)
                .click(function (evt) {
                    close(pane);
                    evt.stopPropagation();
                })
            ;
    };
 
    /**
    * addPinBtn
    *
    * Add a custom Pin button for a pane
    *
    * Four classes are added to the element, based on the paneClass for the associated pane...
    * Assuming the default paneClass and the pin is 'up', these classes are added for a west-pane pin:
    *  - ui-layout-pane-pin
    *  - ui-layout-pane-west-pin
    *  - ui-layout-pane-pin-up
    *  - ui-layout-pane-west-pin-up
    *
    * @param String   selector     jQuery selector for button, eg: ".ui-layout-north .ui-layout-pin"
    * @param String   pane         Name of the pane the pin is for: 'north', 'south', etc.
    */
    function addPinBtn (selector, pane) {
        var $E = getBtn(selector, pane, "pin");
        if ($E) {
            var s = state[pane];
            $E.click(function (evt) {
                setPinState($(this), pane, (s.isSliding || s.isClosed));
                if (s.isSliding || s.isClosed) open( pane ); // change from sliding to open
                else close( pane ); // slide-closed
                evt.stopPropagation();
            });
            // add up/down pin attributes and classes
            setPinState ($E, pane, (!s.isClosed && !s.isSliding));
            // add this pin to the pane data so we can 'sync it' automatically
            // PANE.pins key is an array so we can store multiple pins for each pane
            _c[pane].pins.push( selector ); // just save the selector string
        }
    };
 
    /**
    * syncPinBtns
    *
    * INTERNAL function to sync 'pin buttons' when pane is opened or closed
    * Unpinned means the pane is 'sliding' - ie, over-top of the adjacent panes
    *
    * @callers  open(), close()
    * @params  pane   These are the params returned to callbacks by layout()
    * @params  doPin  True means set the pin 'down', False means 'up'
    */
    function syncPinBtns (pane, doPin) {
        $.each(_c[pane].pins, function (i, selector) {
            setPinState($(selector), pane, doPin);
        });
    };
 
    /**
    * setPinState
    *
    * Change the class of the pin button to make it look 'up' or 'down'
    *
    * @callers  addPinBtn(), syncPinBtns()
    * @param Element  $Pin        The pin-span element in a jQuery wrapper
    * @param Boolean  doPin        True = set the pin 'down', False = set it 'up'
    * @param String   pinClass    The root classname for pins - will add '-up' or '-down' suffix
    */
    function setPinState ($Pin, pane, doPin) {
        var updown = $Pin.attr("pin");
        if (updown && doPin == (updown=="down")) return; // already in correct state
        var
            pin        = options[pane].buttonClass +"-pin"
        ,    side    = pin +"-"+ pane
        ,    UP        = pin +"-up "+    side +"-up"
        ,    DN        = pin +"-down "+side +"-down"
        ;
        $Pin
            .attr("pin", doPin ? "down" : "up") // logic
            .attr("title", doPin ? lang.Unpin : lang.Pin)
            .removeClass( doPin ? UP : DN ) 
            .addClass( doPin ? DN : UP ) 
        ;
    };
 
 
    /*
     *    LAYOUT STATE MANAGEMENT
     *
     *    @example .layout({ cookie: { name: "myLayout", keys: "west.isClosed,east.isClosed" } })
     *    @example .layout({ cookie__name: "myLayout", cookie__keys: "west.isClosed,east.isClosed" })
     *    @example myLayout.getState( "west.isClosed,north.size,south.isHidden" );
     *    @example myLayout.saveCookie( "west.isClosed,north.size,south.isHidden", {expires: 7} );
     *    @example myLayout.deleteCookie();
     *    @example myLayout.loadCookie();
     *    @example var hSaved = myLayout.state.cookie;
     */
 
    function isCookiesEnabled () {
        // TODO: is the cookieEnabled property common enough to be useful???
        return (navigator.cookieEnabled != 0);
    };
    
    /*
     * getCookie
     *
     * Read & return data from the cookie - as JSON
     */
    function getCookie (opts) {
        var
            o        = $.extend( {}, options.cookie, opts || {} )
        ,    name    = o.name || options.name || "Layout"
        ,    c        = document.cookie
        ,    cs        = c ? c.split(';') : []
        ,    pair    // loop var
        ;
        for (var i=0, n=cs.length; i < n; i++) {
            pair = $.trim(cs[i]).split('='); // name=value pair
            if (pair[0] == name) // found the layout cookie
                // convert cookie string back to a hash
                return decodeJSON( decodeURIComponent(pair[1]) );
        }
        return "";
    };
 
    /*
     * saveCookie
     *
     * Get the current layout state and save it to a cookie
     */
    function saveCookie (keys, opts) {
        var
            o        = $.extend( {}, options.cookie, opts || {} )
        ,    name    = o.name || options.name || "Layout"
        ,    params    = ''
        ,    date    = ''
        ,    clear    = false
        ;
        if (o.expires.toUTCString)
            date = o.expires;
        else if (typeof o.expires == 'number') {
            date = new Date();
            if (o.expires > 0)
                date.setDate(date.getDate() + o.expires);
            else {
                date.setYear(1970);
                clear = true;
            }
        }
        if (date)        params += ';expires='+ date.toUTCString();
        if (o.path)        params += ';path='+ o.path;
        if (o.domain)    params += ';domain='+ o.domain;
        if (o.secure)    params += ';secure';
 
        if (clear) {
            state.cookie = {}; // clear data
            document.cookie = name +'='+ params; // expire the cookie
        }
        else {
            state.cookie = getState(keys || o.keys); // read current panes-state
            document.cookie = name +'='+ encodeURIComponent( encodeJSON(state.cookie) ) + params; // write cookie
        }
 
        return $.extend({}, state.cookie); // return COPY of state.cookie
    };
 
    /*
     * deleteCookie
     *
     * Remove the state cookie
     */
    function deleteCookie () {
        saveCookie('', { expires: -1 });
    };
 
    /*
     * loadCookie
     *
     * Get data from the cookie and USE IT to loadState
     */
    function loadCookie (opts) {
        var o = getCookie(opts); // READ the cookie
        if (o) {
            state.cookie = $.extend({}, o); // SET state.cookie
            loadState(o);    // LOAD the retrieved state
        }
        return o;
    };
 
    /*
     * loadState
     *
     * Update layout options from the cookie, if one exists
     */
    function loadState (opts) {
        $.extend( true, options, opts ); // update layout options
    };
 
    /*
     * getState
     *
     * Get the *current layout state* and return it as a hash
     */
    function getState (keys) {
        var
            data    = {}
        ,    alt        = { isClosed: 'initClosed', isHidden: 'initHidden' }
        ,    pair, pane, key, val
        ;
        if (!keys) keys = options.cookie.keys; // if called by user
        if ($.isArray(keys)) keys = keys.join(",");
        // convert keys to an array and change delimiters from '__' to '.'
        keys = keys.replace(/__/g, ".").split(',');
        // loop keys and create a data hash
        for (var i=0,n=keys.length; i < n; i++) {
            pair = keys[i].split(".");
            pane = pair[0];
            key  = pair[1];
            if (_c.allPanes.indexOf(pane) < 0) continue; // bad pane!
            val = state[ pane ][ key ];
            if (val == undefined) continue;
            if (key=="isClosed" && state[pane]["isSliding"])
                val = true; // if sliding, then *really* isClosed
            ( data[pane] || (data[pane]={}) )[ alt[key] ? alt[key] : key ] = val;
        }
        return data;
    };
 
    /*
     * encodeJSON
     *
     * Stringify a JSON hash so can save in a cookie or db-field
     */
    function encodeJSON (JSON) {
        return parse( JSON );
        function parse (h) {
            var D=[], i=0, k, v, t; // k = key, v = value
            for (k in h) {
                v = h[k];
                t = typeof v;
                if (t == 'string')        // STRING - add quotes
                    v = '"'+ v +'"';
                else if (t == 'object')    // SUB-KEY - recurse into it
                    v = parse(v);
                D[i++] = '"'+ k +'":'+ v;
            }
            return "{"+ D.join(",") +"}";
        };
    };
 
    /*
     * decodeJSON
     *
     * Convert stringified JSON back to a hash object
     */
    function decodeJSON (str) {
        try { return window["eval"]("("+ str +")") || {}; }
        catch (e) { return {}; }
    };
 
 
/*
 * #####################
 * CREATE/RETURN LAYOUT
 * #####################
 */
 
    // validate that container exists
    var $Container = $(this).eq(0); // FIRST matching Container element
    if (!$Container.length) {
        alert( lang.errContainerMissing );
        return null;
    };
    // return Instance if layout has already been initialized
    if ($Container.data("layoutContainer"))
        return $.extend( {}, window[ $Container.data("layoutContainer") ] );
 
    // init global vars
    var 
        $Ps    = {} // Panes x5    - set in initPanes()
    ,    $Cs    = {} // Content x5    - set in initPanes()
    ,    $Rs    = {} // Resizers x4    - set in initHandles()
    ,    $Ts    = {} // Togglers x4    - set in initHandles()
    //    aliases for code brevity
    ,    sC    = state.container // alias for easy access to 'container dimensions'
    ,    sID    = state.id // alias for unique layout ID/namespace - eg: "layout435"
    ;
 
    // create the border layout NOW
    _create();
 
    // return object pointers to expose data & option Properties, and primary action Methods
    var Instance = {
        options:        options            // property - options hash
    ,    state:            state            // property - dimensions hash
    ,    container:        $Container        // property - object pointers for layout container
    ,    panes:            $Ps                // property - object pointers for ALL Panes: panes.north, panes.center
    ,    resizers:        $Rs                // property - object pointers for ALL Resizers, eg: resizers.north
    ,    togglers:        $Ts                // property - object pointers for ALL Togglers, eg: togglers.north
    ,    toggle:            toggle            // method - pass a 'pane' ("north", "west", etc)
    ,    open:            open            // method - ditto
    ,    close:            close            // method - ditto
    ,    hide:            hide            // method - ditto
    ,    show:            show            // method - ditto
    ,    resizeContent:    sizeContent        // method - ditto - DEPRICATED - "resize" is inconsistent
    ,    sizeContent:    sizeContent        // method - pass a 'pane'
    ,    sizePane:        manualSizePane    // method - pass a 'pane' AND an 'outer-size' in pixels or percent, or 'auto'
    ,    swapPanes:        swapPanes        // method - pass TWO 'panes' - will swap them
    ,    resizeAll:        resizeAll        // method - no parameters
    ,    destroy:        destroy            // method - no parameters
    ,    setSizeLimits:    setSizeLimits    // method - pass a 'pane' - update state min/max data
    ,    bindButton:        bindButton        // utility - pass element selector, 'action' and 'pane' (E, "toggle", "west")
    ,    addToggleBtn:    addToggleBtn    // utility - pass element selector and 'pane' (E, "west")
    ,    addOpenBtn:        addOpenBtn        // utility - ditto
    ,    addCloseBtn:    addCloseBtn        // utility - ditto
    ,    addPinBtn:        addPinBtn        // utility - ditto
    ,    allowOverflow:    allowOverflow    // utility - pass calling element (this)
    ,    resetOverflow:    resetOverflow    // utility - ditto
    ,    encodeJSON:        encodeJSON        // method - pass a JSON object
    ,    decodeJSON:        decodeJSON        // method - pass a string of encoded JSON
    ,    getState:        getState        // method - returns hash of current layout-state
    ,    getCookie:        getCookie        // method - update options from cookie - returns hash of cookie data
    ,    saveCookie:        saveCookie        // method - optionally pass keys-list and cookie-options (hash)
    ,    deleteCookie:    deleteCookie    // method
    ,    loadCookie:        loadCookie        // method - update options from cookie - returns hash of cookie data
    ,    loadState:        loadState        // method - pass a hash of state to use to update options
    ,    cssWidth:        cssW            // utility - pass element and target outerWidth
    ,    cssHeight:        cssH            // utility - ditto
    ,    isMouseOver:    isMouseOver        // utility - pass any element OR 'pane' - returns true or false
    };
 
    // create a global instance pointer
    window[ sID ] = Instance;
 
    // return the Instance object
    return Instance;
 
}
})( jQuery );
