var lastLayer = "";

function showMenu(name)
{

	if (document.all[name].style.display != "none")
	{
		document.all[name].style.display = "none";
	}
	else
	{
		document.all[name].style.display = ""
	
		if(lastLayer != "" && name != lastLayer)
		{
			document.all[lastLayer].style.display = "none";
		}

		lastLayer = name;
	}
}