function toggleLayer(whichLayer)
{
	if (document.getElementById){
		// this is the way the standards work
		var lestyle2 = document.getElementById(whichLayer).style;
		lestyle2.display = lestyle2.display? "":"none";
	}else if (document.all){
		// this is the way old msie versions work
		var lestyle2 = document.all[whichLayer].style;
		lestyle2.display = lestyle2.display? "":"none";
	}else if (document.layers){
		// this is the way nn4 works
		var lestyle2 = document.layers[whichLayer].style;
		lestyle2.display = lestyle2.display? "":"none";
	}
}