var state = 'hidden';

	function showhide(layer_ref) {
								
		if (state == 'visible') {
			state = 'hidden';
			}
		else {
			state = 'visible';
		}
		if (document.all) { //IS IE 4 or 5 (or 6 beta)
			eval( "document.all." + layer_ref + ".style.visibility = state");
		}
		if (document.layers) { //IS NETSCAPE 4 or below
			document.layers[layer_ref].visibility = state;
		}
		if (document.getElementById && !document.all) {
			maxwell_smart = document.getElementById(layer_ref);
			maxwell_smart.style.visibility = state;
		}
	}