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

function hideLayer(layerName)
{
    if (document.getElementById) // Netscape 6 and IE 5+
    {
	  var targetElement = document.getElementById(layerName);
	  targetElement.style.display = 'none';
    }
}