function right(e) {
  var msg = "Warning - these images are protected by Copyright Contactlenses Ltd";
  if (navigator.appName == 'Netscape' && e.which == 3) {
    alert(msg);
    return false;
  }
  if (navigator.appName == 'Microsoft Internet Explorer' && event.button==2) {
    alert(msg);
    return false;
  }
  else return true;
}

function trap()  {
  if(document.images)  {
    for(i=0;i<document.images.length;i++)  {
      document.images[i].onmousedown = right;
      document.images[i].onmouseup = right;
    }
  }
}