sfHover = function() {  
    var sfEls = document.getElementById("navbar").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);