function click (e) {
if (!e) e = window.event;
if ((e.type && e.type == "contextmenu") || (e.button && e.button == 2) || (e.which && e.which == 3)) {
alert("Die rechte Maustaste ist gesperrt!");
return false;
}
}
if (document.layers) document.captureEvents(Event.MOUSEDOWN);
document.onmousedown = click;
document.oncontextmenu = click;