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);