function toggleLayer(whichLayer)
		{
			if (document.getElementById)
			{
			// this is the way the standards work
			var style2 = document.getElementById(whichLayer).style;
			style2.display = style2.display? "":"block";
			}
			else if (document.all)
			{
			// this is the way old msie versions work
			var style2 = document.all[whichLayer].style;
			style2.display = style2.display? "":"block";
			}
			else if (document.layers)
			{
			// this is the way nn4 works
			var style2 = document.layers[whichLayer].style;
			style2.display = style2.display? "":"block";
			}
		}