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Window.onbeforeunload

·

window.onbeforeunload = function (evt) {
  var message = 'Are you sure you want to leave?';
  if (typeof evt == 'undefined') {
    evt = window.event;
  }
  if (evt) {
    evt.returnValue = message;
  }
  return message;
}

http://www.highdots.com/forums/archive/index.php/t-66363.html
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