var ExtJs = function (){
	var onWindowScrollListeners = new Array();
	
	function onWindowScrollHandler(evt){
		for(var i=0; i<onWindowScrollListeners.length; i++)
		{
			var listener = onWindowScrollListeners[i];
			if(listener.scope!=null)
				listener.scope.fn(listener.options);
			else
				listener.fn(listener.options);
		}
	}
	
	window.onscroll = onWindowScrollHandler;

	return {
		init : function (){
		},
	    
	    onWindowScroll : function(fn, scope, options){
			onWindowScrollListeners[onWindowScrollListeners.length] = {fn:fn, scope:scope, options: options};
	    }
    };
}();

Ext.onReady(ExtJs.init,ExtJs,true);