window.addEvent('domready', function(){
		if($('main_nav')) {	
			$('main_nav').getElements('li.menu').each( function(elem){
					
				var list = elem.getElement('ul.sub_nav');
				if(list) {
					var myFx = new Fx.Slide(list).hide();
					//console.log(myFx);
					elem.addEvents({
						'mouseenter' : function(){
							list.setStyle('display', 'block');
							myFx.cancel();
							myFx.slideIn();
						},
						'mouseleave' : function(){
							list.getParent('div').setStyle('overflow','hidden');
					
							myFx.cancel();
							myFx.slideOut();
							//.chain(function() { alert($('temporary-power').getElement('div').getElement('div').getSize().y)});
							
							
						}
					});
				}
			});
		}
});