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Ext.applyIf(String, {
    /**
     * Allows you to define a tokenized string and pass an arbitrary number of arguments to replace the tokens.  Each
     * token must be unique, and must increment in the format {0}, {1}, etc.  Example usage:
     * <pre><code>
var cls = 'my-class', text = 'Some text';
var s = String.format('&lt;div class="{0}">{1}&lt;/div>', cls, text);
// s now contains the string: '&lt;div class="my-class">Some text&lt;/div>'
     * </code></pre>
     * @param {String} string The tokenized string to be formatted
     * @param {String} value1 The value to replace token {0}
     * @param {String} value2 Etc...
     * @return {String} The formatted string
     * @static
     */
    format : function(format){
        var args = Ext.toArray(arguments, 1);
        return format.replace(/\{(\d+)\}/g, function(m, i){
            return args[i];
        });
    }
});

/**
 * @class Array
 */
Ext.applyIf(Array.prototype, {
    /**
     * Checks whether or not the specified object exists in the array.
     * @param {Object} o The object to check for
     * @param {Number} from (Optional) The index at which to begin the search
     * @return {Number} The index of o in the array (or -1 if it is not found)
     */
    indexOf : function(o, from){
        var len = this.length;
        from = from || 0;
        from += (from < 0) ? len : 0;
        for (; from < len; ++from){
            if(this[from] === o){
                return from;
            }
        }
        return -1;
    },

    /**
     * Removes the specified object from the array.  If the object is not found nothing happens.
     * @param {Object} o The object to remove
     * @return {Array} this array
     */
    remove : function(o){
        var index = this.indexOf(o);
        if(index != -1){
            this.splice(index, 1);
        }
        return this;
    }
});
/**
 * @class Ext.util.TaskRunner
 * Provides the ability to execute one or more arbitrary tasks in a multithreaded
 * manner.  Generally, you can use the singleton {@link Ext.TaskMgr} instead, but
 * if needed, you can create separate instances of TaskRunner.  Any number of
 * separate tasks can be started at any time and will run independently of each
 * other. Example usage:
 * <pre><code>
// Start a simple clock task that updates a div once per second
var updateClock = function(){
    Ext.fly('clock').update(new Date().format('g:i:s A'));
} 
var task = {
    run: updateClock,
    interval: 1000 //1 second
}
var runner = new Ext.util.TaskRunner();
runner.start(task);

// equivalent using TaskMgr
Ext.TaskMgr.start({
    run: updateClock,
    interval: 1000
});

 * </code></pre>
 * <p>See the {@link #start} method for details about how to configure a task object.</p>
 * Also see {@link Ext.util.DelayedTask}. 
 * 
 * @constructor
 * @param {Number} interval (optional) The minimum precision in milliseconds supported by this TaskRunner instance
 * (defaults to 10)
 */
Ext.util.TaskRunner = function(interval){
    interval = interval || 10;
    var tasks = [], 
    	removeQueue = [],
    	id = 0,
    	running = false,

    	// private
    	stopThread = function(){
	        running = false;
	        clearInterval(id);
	        id = 0;
	    },

    	// private
    	startThread = function(){
	        if(!running){
	            running = true;
	            id = setInterval(runTasks, interval);
	        }
	    },

    	// private
    	removeTask = function(t){
	        removeQueue.push(t);
	        if(t.onStop){
	            t.onStop.apply(t.scope || t);
	        }
	    },