sfHover = function() {
	var sfElsParent = document.getElementById("horiz_nav");
	if(!sfElsParent){return}; // prevents IE from throwing an error
	var sfElms = sfParent.getElementsByTagName("TD");
	if(!sfEls){return};
	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);