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