function expand(node)
{
	var good = false;
	ul = document.getElementById("ul" + node);
	ul1 = document.getElementById("n" + node);
	img = document.getElementById("img" + node);
	if (good = (ul != null && img != null && ul.className != null && ul.innerHTML != null))
	{
		str = img.src;
		if ((ul.className == "Shown") || (ul.className == ""))
		{
			ul.className = "Hidden";
			ul1.className = "Shown";
			img.src = str.substr(0, str.length-5) + "_.gif";
		}
		else
			if (ul.className == "Hidden")
			{
				img.src = str.substr(0, str.length-5) + "+.gif";
				ul.className = "Shown";
				ul1.className = "Hidden";
			}

	}
	return true;
}