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);