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