function click(e) {
var message="Direitos reservados.";

	if (document.all) {
		if (event.button==2||event.button==3) {
			alert(message);
			return false;
		}
	}
	if (document.layers) {
		if (e.which == 3) {
			alert(message);
			return false;
		}
	}
}

if (document.layers) {
		document.captureEvents(Event.MOUSEDOWN);
}
document.onmousedown=click;