sfHover = function() {    
 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);