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";

		}

		}