function tC(item) {
	for (i=0; i<item.children.length; i++) {
		var cnode = item.children.item(i);
		if (cnode.tagName != "OL")
			continue;
		if (cnode.style.display == "block")
			cnode.style.display = "none";
		else
			cnode.style.display = "block";
	}
}