function toggleLayer(whichLayer)
{
	if (document.getElementById)
	{
		// Standard
		var style2 = document.getElementById(whichLayer).style;
		style2.display = style2.display? "":"none";
	}
	else if (document.all)
	{
		// For Explorer
		var style2 = document.all[whichLayer].style;
		style2.display = style2.display? "":"block";
	}
	else if (document.layers)
	{
		// For Netscape
		var style2 = document.layers[whichLayer].style;
		style2.display = style2.display? "":"display";
	}
}