var ns4 = document.layers;
var ns6 = document.getElementById && !document.all;
var ie4 = document.all;
	
function GetLayer(divName)
{
	if (ns4) { return document.layers[divName]; }
	else if (ns6) { return document.getElementById(divName); }
	else if (ie4) { return document.all[divName]; }
}

function ShowLayer(divName)
{
	var div = GetLayer(divName);
	
	if (div != undefined)
	{
		if (ns4) { div.visibility = "visible"; div.display = "block"; }
		else if (ns6) { div.style.visibility = "visible"; div.style.display = "block"; }
		else if (ie4) { div.style.visibility = "visible"; div.style.display = "block"; }
	}
}

function HideLayer(divName)
{
	var div = GetLayer(divName);

	if (div != undefined)
	{
		if (ns4) { div.visibility = "hidden"; div.display = "none"; }
		else if (ns6) { div.style.visibility = "hidden"; div.style.display = "none"; }
		else if (ie4) { div.style.visibility = "hidden"; div.style.display = "none"; }
	}
}