var SiteIe = {	
  	start : function () {
    window.addEvent('domready', function() { 
		$$('#gaos_top_menu li').addEvents({
			'mouseenter': function(){
				this.className += " over";
			},
			'mouseleave': function(){
				this.className = this.className.replace(" over", "");
			}
		});
    });
  }
}
window.addEvent('load', SiteIe.start);