var message="Images on this website are copyrighted.  Please do not copy any images.  Thank you.";

function clickIE4(){
  if (event.button == 2){
    alert();
    return false;
  }
}

function clickNS4(e){
  if (document.layers || document.getElementById && !document.all){
    if (e.which == 2 || e.which == 3){
      alert(message);
      return false;
    }
  }
}

if (document.layers){
  document.captureEvents(Event.MOUSEDOWN);
  document.onmousedown=clickNS4;
} else if (document.all && !document.getElementById){
  document.onmousedown=clickIE4;
}

document.oncontextmenu = new Function("alert(message); return false")