sfHover = function()
{
   var sfEls = document.getElementById("navMain").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);
}