// JavaScript Document
var ul = document.getElementById("ul_mainNav");
var li = ul.getElementsByTagName("li");

for(i=0; i<li.length; i++){
li[i].ids = i;

li[i].onmouseover = function(){
		var m=this.ids;
		li[m].className = "over";
		}
li[i].onmouseout = function(){
		var m=this.ids;
		li[m].className = "";
		}

}