sfHover = function() {

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