function expandCat()
{
	Element.toggleClassName(this, "open");
	Element.toggleClassName(this.parentNode, "open");
	return false;
}

function td_init()
{
	var as = $$("#catNav a");
	for (var i = 0; i < as.length; i++) {
		var a = as[i];
		if (a.parentNode.parentNode.id == "catNav") {
			a.onclick = expandCat;
		}
	}
}