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) 
	{
		var targetElement = document.getElementById(layerName);
		targetElement.style.display = 'none';
	}
}



function toggle_visibility(id) {
	var e = document.getElementById(id);
	
	if(e.style.display == '')
	e.style.display = 'block';
	else
	if(e.style.display == 'none')
	e.style.display = 'block';
	else
	e.style.display = 'none';
}