function toggleLayer(whichLayer)
{
	if (document.getElementById){
		var style2 = document.getElementById(whichLayer).style;
		style2.display = style2.display? "":"block";
	}else if (document.all){
		var style2 = document.all[whichLayer].style;
		style2.display = style2.display? "":"block";
	}else if (document.layers){
		var style2 = document.layers[whichLayer].style;
		style2.display = style2.display? "":"block";
	}
}