function click (e) {
	if (!e)
		e = window.event;
	if ((e.type && e.type == "contextmenu") || (e.button && e.button == 2) || (e.which && e.which == 3)) {
		if (window.opera)
			window.alert("Sorry: Diese Funktion ist deaktiviert.");
		return false;
	}
}
if (document.layers)
	document.captureEvents(Event.MOUSEDOWN);
document.onmousedown = click;
document.oncontextmenu = click;