Event.observe(window, 'load', function() {
    Event.observe(document, 'contextmenu', function(event) {
        Event.stop(event);
        // Display the issue one way or another
    });


    Event.observe(document, 'keydown', function(event) {
        var key = event.which || event.keyCode;
        if (key == 17) {
            Event.stop(event);
        }
        // Display the issue one way or another
    });
});