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);