var lastSubnav;
function toggleSubnav(e) {
	if (!e) var e = window.event;
	var targ;
	if (e.target) targ = e.target;
	else if (e.srcElement) targ = e.srcElement;
	if (targ.nodeType == 3) // defeat Safari bug
		targ = targ.parentNode;
	
	var node = targ.parentNode.childNodes[1];
	if (node.style.display == "block")
		node.style.display = "none";
	else {
		if (lastSubnav) lastSubnav.style.display = "none";
		node.style.display = "block";
		lastSubnav = node;
	}
}