function showLayer(layerName)
{
	if (document.getElementById) // Netscape 6 and IE 5+
	{
		var targetElement = document.getElementById(layerName);
		targetElement.style.visibility = 'visible';
	}
}
function hideLayer(layerName)
{
	if (document.getElementById) 
	{
		var targetElement = document.getElementById(layerName);
		targetElement.style.visibility = 'hidden';
	}
}