function disableRightClick(e){
  var message = "clique droit désactivé";
  
  if(!document.rightClickDisabled){
    if(document.layers){
      document.captureEvents(Event.MOUSEDOWN);
      document.onmousedown = disableRightClick;
    }
    else document.oncontextmenu = disableRightClick;
    return document.rightClickDisabled = true;
  }
  if(document.layers || (document.getElementById && !document.all)){
    if (e.which==2||e.which==3){
      alert(message);
      return false;
    }
  }
  else
  {
    alert(message);
    return false;
  }
}
disableRightClick();