var jshover = function()
{
   var menuDiv = document.getElementById("nav")
   if (!menuDiv)
      return;

   var sfEls = menuDiv.getElementsByTagName("li");
   for (var i=0; i<sfEls.length; i++)
   {
      sfEls[i].onmouseover=function()
      {
         this.className+=" jshover";
      }
      sfEls[i].onmouseout=function()
      {
         this.className=this.className.replace(new RegExp(" jshover\\b"), "");
      }
   }
}

if (window.attachEvent)
   window.attachEvent("onload", jshover);