var sfHover = function() {
    var navs = $$("div.nav");
    
    if(navs[0]){
        var sfEls = navs[0].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);