function click(e) {
  if (document.all) {
    if (event.button==2||event.button==3) {
      oncontextmenu='return false';
    }
  }
  if (document.layers) {
    if (e.which==3) {
      oncontextmenu='return false';
    }
  }
  if (document.layers) {
    document.captureEvents(Event.MOUSEDOWN);
  }
}