var ob;

function showOverlays(id) {
	ob = new OpaqueBox();
	ob.show();
	$('overlays').set({'styles':{'display': 'block'}});
	$$('.overlay').each(function(overlay) {
		overlay.set({'styles':{'display': 'none'}});
	});
	$(id).set({'styles':{'display': 'block'}});
}

function hideOverlays() {
	if (ob != null) {
		ob.hide();
	}

	$$('.overlay').each(function(overlay) {
		overlay.set({'styles':{'display': 'none'}});
	});
}