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 (document.all) { //MS IE
    if (window.attachEvent)
        window.attachEvent("onload", sfHover);
    else { //IE 5.2 Mac does not support attachEvent
        var old = window.onload;
        window.onload = function() { if (old) old(); sfHover(); }
    }
}