var ns4 = (document.layers);
var ie4 = (document.all && !document.getElementById);
var ie5 = (document.all && document.getElementById);
var ns6 = (!document.all && document.getElementById);

function getElement(id)
{
	var elem;

	// Netscape 4
	if(ns4)
	{
		elem = document.layers[id];
	}
	// Explorer 4
	else if(ie4)
	{
		elem = document.all[id];
	}
	// W3C - Explorer 5+ and Netscape 6+
	else if(ie5 || ns6)
	{
		elem = document.getElementById(id);
	}
	return elem;
}

function show(id)
{
	var elem = getElement(id);
	//elem.style.visibility = "visible";
	elem.style.display = "block";
}

function hide(id)
{
	var elem = getElement(id);
	//elem.style.visibility = "visible";
	elem.style.display = "none";
}

function showNode(nodeid)
{
//alert("+" + nodeid)
	show(nodeid);
//	var node = document.getElementById(nodeid);
//	node.className = "visShowing";
}

function hideNode(nodeid)
{
//alert("-" + nodeid)
	hide(nodeid);
//	var node = document.getElementById(nodeid);
//	node.className = "visHidden";
}