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

tfHover = function() {
    var sfEls = document.getElementById("headerTopNav").getElementsByTagName("li");
    for (var i = 0; i < sfEls.length; i++) {
        sfEls[i].onmouseover = function() {
            this.className += " tfhover";
        }
        sfEls[i].onmouseout = function() {
            this.className = this.className.replace(new RegExp(" tfhover\\b"), "");
        }
    }
}
if (window.attachEvent) window.attachEvent("onload", tfHover);