sfHover=function()
{
   if(document.getElementById('nav'))
   {
      var sfEls=document.getElementById("nav").getElementsByTagName("LI");
      for(var i=0;i<sfEls.length;i++)
      {
         sfEls[i].onmouseover=function()
         {
            this.className+=" sfhover";
         }
         sfEls[i].onmouseout=function()
         {
            this.className=this.className.replace(new RegExp(" sfhover\\b"),"");
         }
      }
   }
}
if(window.attachEvent)
{
   window.attachEvent("onload",sfHover);
}