var Rules = {
    'ul.submenu:loaded': function(element) {
        Element.hide(element);
    },

    '#homemenu li.staff a.bigbutton:mouseover': function(element) {
        var submenu = element.next();
        Element.toggle(submenu);
    },

    'ul.submenu:mouseout': function(element) {
        if (element.className == "submenu") {
            Element.toggle(element);
        }
    }
}

sfHover = function() {
    var sfEls = document.getElementById("homemenu").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"), "");
        }
    }
}