function toggleLayer(whichLayer, hideLayer) {
	if (document.getElementById) {
		// this is the way the standards work
		var style2 = document.getElementById(whichLayer).style;
		var style3 = document.getElementById(hideLayer).style;
		style2.display = style2.display? "":"block";
		style3.display = style3.display? "":"none";
	}
	else if (document.all) {
		// this is the way old msie versions work
		var style2 = document.all[whichLayer].style;
		var style3 = document.all[hideLayer].style;
		style2.display = style2.display? "":"block";
		style3.display = style3.display? "":"none";
	}
	else if (document.layers) {
		// this is the way nn4 works
		var style2 = document.layers[whichLayer].style;
		var style3 = document.layers[hideLayer].style;
		style2.display = style2.display? "":"block";
		style3.display = style3.display? "":"none";
	}
}