Event.observe(window, 'load',function (){
		lis = $('menu').getElementsBySelector('li');
		for(i=0;i<lis.length;i++){
			lis[i].onmouseover = function(){
				this.addClassName('over');
			}
			
			lis[i].onmouseout = function(){
				this.removeClassName('over');
			}
		}
	})