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;
	}
}