function isVisible(item) {
	return (item.className == "selected");
}

function show(item) {
	var aItems = item.getElementsByTagName("a");
	aItems[0].style.background = 'transparent url(../images/sign_minus_black.gif) no-repeat top left';
	return item.className = "selected";
}

function hide(item) {
	var aItems = item.getElementsByTagName("a");
	aItems[0].style.background = 'transparent url(../images/sign_plus_black.gif) no-repeat top left';
	return item.className = "hidden";
}

function addTier3Behavior() {
	var nitems = document.getElementById("tier3_nav").getElementsByTagName("li");
	var items = Array();

	for(var i=0; nitems[i]; i++) {
		if(nitems[i].parentNode.parentNode == document.getElementById("tier3_nav"))
			items.push(nitems[i]);
	}


	for(var i = 0; items[i]; i++) {
		if(items[i].className != "selected")
			hide(items[i]);
		else
			show(items[i]);
		
		/*
		items[i].getElementsByTagName("a")[0].onclick = function() {
			if(isVisible(this.parentNode)) {
				hide(this.parentNode);
			} else {
				for(var j = 0; items[j]; j++) {
					hide(items[j]);
				}
				show(this.parentNode);
			}

			return false;
		}*/
	}
}

addLoadEvent(addTier3Behavior);