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;