document.onmousedown=right;
  if (document.layers) window.captureEvents(Event.MouseDown); { window.onmousedown=right; }

  function right(click)
  { if (navigator.appName == 'Netscape' && (click.which == 2 || click.which == 3)) { return false; } 
       else if (navigator.appName == 'Microsoft Internet Explorer' && (event.button == 2 || event.button == 3))
                { vQuestion = confirm("Impressum anzeigen?");
                   if (vQuestion) location.href = "impressum.html"; {return false; }
                }
      return true;
  }