function initNodes()
	{
	var uls = document.getElementsByTagName("ul");
	var i;
		for(i = 0; i < uls.length; i++)
			if(uls[i].id != "root")
				uls[i].style.display = "none";
	}

function clickNode(id)
	{
	var node = document.getElementById(id);
		if(node.style.display == "none")
			node.style.display = "block";
		else
			node.style.display = "none";
		return false;
	}