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

function initLoad()
{
   var oldOnload = window.onload;      
   window.onload = function()
   {
      if (oldOnload) try{oldOnload();}catch(e){}
      sfHover();	      
   }
}
initLoad();