function cssmenuhover()
{
 if(!document.getElementById("cssmenu"))
 return;

 var lis = document.getElementById("cssmenu").getElementsByTagName("LI");

 for (var i=0;i<lis.length;i++)
 {
  if (lis[i].className == 'sub')
  {
   lis[i].onmouseover=function(){this.className+=" hover";}
   lis[i].onmouseout=function(){this.className=this.className.replace(new RegExp(" hover\\b"), "");}
  }
 }
}
if (window.attachEvent)
    window.attachEvent("onload", cssmenuhover);