function menu(){
var li=document.getElementById("nav").getElementsByTagName("li");
for(var i=0;i<li.length;i++){
li[i].onmouseover=function(){
this.className="navs";}
li[i].onmouseout=function(){
this.className="";}
}
}
window.onload=menu;

function AClass(obj){document.getElementById("sub"+obj).className="aa";}

function AClass1(obj){document.getElementById("subb"+obj).className="hover";}