// BEGIN FUNCTION: showHide
//         AUTHOR: Robert W. Makynen
//        PURPOSE: Show/hide layers based on selection
//           DATE: June 19, 2008
var layerState = 'none';

function showHide(layerRef) {

	if (layerState == 'block') {
		layerState = 'none';
	} else {
		layerState = 'block';
	}

	if (document.all) { // Internet Explorer
		eval( "document.all." + layerRef + ".style.display = layerState");
	}

	if (document.layers) { // Netscape
		document.layers[layerRef].display = layerState;
	}
	
	if (document.getElementById && !document.all) {
		refElement = document.getElementById(layerRef);
		refElement.style.display = layerState;
	}
}
// END FUNCTION: showHide