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