Javascript To Get An Alert To Redirect When Closing The Browser Window

window.onbeforeunload = fget;
function yPop(url) {
  var found = 1;
  window.onbeforeunload = '';
  window.location = url;
  return false;
}
function fget() {
  alert("Thank you for visiting our website, you are welcome any time! nn");
  window.location = "http://NewLink.com";
  return "n________________________nn PRESS 'CANCEL' To Stay On The Current Page nn________________________n";
}

$(window).unload( function () { alert("Bye now!"); } );

<html>
 <head>
 <script type="text/javascript">
  var hook = true;
  window.onbeforeunload = function() {
    if (hook) {
      return "Did you save your stuff?"
    }
  }
  function unhook() {
    hook=false;
  }
</script>
</head>
<body>
<!-- this will ask for confirmation: -->
<a href="http://google.com">external link</a>

<!-- this will go without asking: -->
<a href="test.html" onClick="unhook()">internal link, un-hooked</a>

</body>
</html>