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     * </ul></p>
     * <p>Before each invocation, Ext injects the property <code>taskRunCount</code> into the task object so
     * that calculations based on the repeat count can be performed.</p>
     * @return {Object} The task
     */
    this.start = function(task){
        tasks.push(task);
        task.taskStartTime = new Date().getTime();
        task.taskRunTime = 0;
        task.taskRunCount = 0;
        startThread();
        return task;
    };

    /**
     * Stops an existing running task.
     * @method stop
     * @param {Object} task The task to stop
     * @return {Object} The task
     */
    this.stop = function(task){
        removeTask(task);
        return task;
    };

    /**
     * Stops all tasks that are currently running.
     * @method stopAll
     */
    this.stopAll = function(){
        stopThread();
        for(var i = 0, len = tasks.length; i < len; i++){
            if(tasks[i].onStop){
                tasks[i].onStop();
            }
        }
        tasks = [];
        removeQueue = [];
    };
};

/**
 * @class Ext.TaskMgr
 * @extends Ext.util.TaskRunner
 * A static {@link Ext.util.TaskRunner} instance that can be used to start and stop arbitrary tasks.  See
 * {@link Ext.util.TaskRunner} for supported methods and task config properties.
 * <pre><code>
// Start a simple clock task that updates a div once per second
var task = {
    run: function(){
        Ext.fly('clock').update(new Date().format('g:i:s A'));
    },
    interval: 1000 //1 second
}
Ext.TaskMgr.start(task);
</code></pre>
 * <p>See the {@link #start} method for details about how to configure a task object.</p>
 * @singleton
 */
Ext.TaskMgr = new Ext.util.TaskRunner();if(typeof YAHOO == "undefined"){
    throw "Unable to load Ext, core YUI utilities (yahoo, dom, event) not found.";
}

(function(){
    var E = YAHOO.util.Event,
        D = YAHOO.util.Dom,
        CN = YAHOO.util.Connect,
        ES = YAHOO.util.Easing,
        A = YAHOO.util.Anim,
        libFlyweight,
        version = YAHOO.env.getVersion('yahoo').version.split('.'),
        mouseEnterSupported = parseInt(version[0], 10) >= 3,
        mouseCache = {},
        elContains = function(parent, child){
            if(parent && parent.firstChild){
                while(child){
                    if(child === parent){
                        return true;
                    }
                    child = child.parentNode;
                    if(child && (child.nodeType != 1)){
                        child = null;
                    }
                }
            }
            return false;
        }, checkRelatedTarget = function(e){
            return !elContains(e.currentTarget, Ext.lib.Event.getRelatedTarget(e));
        };

Ext.lib.Dom = {
    getViewWidth : function(full){
        return full ? D.getDocumentWidth() : D.getViewportWidth();
    },

    getViewHeight : function(full){
        return full ? D.getDocumentHeight() : D.getViewportHeight();
    },

    isAncestor : function(haystack, needle){
        return D.isAncestor(haystack, needle);
    },

    getRegion : function(el){
        return D.getRegion(el);
    },

    getY : function(el){
        return this.getXY(el)[1];
    },

    getX : function(el){
        return this.getXY(el)[0];
    },

    // original version based on YahooUI getXY
    // this version fixes several issues in Safari and FF
    // and boosts performance by removing the batch overhead, repetitive dom lookups and array index calls
    getXY : function(el){
        var p, pe, b, scroll, bd = (document.body || document.documentElement);
        el = Ext.getDom(el);