How to prevent closing browser window?

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Another implementation is the following you can find it in this webpage:
http://ujap.de/index.php/view/JavascriptCloseHook

<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="anotherPage.html" onClick="unhook()">internal link, un-hooked</a>
  </body>
</html>

What it does is you use a variable as a flag.

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