sfHover = function() {
	var sfHNavEls = document.getElementById("horiz_nav").getElementsByTagName("TD");
	for (var i=0; i<sfHNavEls.length; i++) {
		sfHNavEls[i].onmouseover=function() {
			this.className+=" sfhover";
		}
		sfHNavEls[i].onmouseout=function() {
			this.className=this.className.replace(new RegExp(" sfhover\\b"), "");
		}
	}
}
if (window.attachEvent) window.attachEvent("onload",sfHover);