window.addEvent('domready',function(e){
	var cats = $ES('#main_nav li');
	cats.each(function(cat, i){
		var popup = cat.getElement('.nav_pop');
		if(popup){
			cat.addEvents({
				'mouseenter':function(){
					this.addClass('selected');
					popup.setStyle('display','block');
				},
				'mouseleave':function(){
					this.removeClass('selected');
					popup.setStyle('display','none');
				}
			});
		}
	});
});