function right(e) {
 if (navigator.appName == 'Netscape' && (e.which == 3 || e.which == 2)) return false;
 else
 if (navigator.appName == 'Microsoft Internet Explorer' && (event.button == 2 || event.button == 3)) {
  alert("Functie niet beschikbaar.");return false;
 }
 return true;
}


document.onmousedown=right;
document.onmouseup=right;
if (document.layers) window.captureEvents(Event.MOUSEDOWN);
if (document.layers) window.captureEvents(Event.MOUSEUP);
window.onmousedown=right;
window.onmouseup=right;
//  End -->