Javascript alert when user closes the tab ot the window

I want when a user closes the tab or window or when he tries to move to another location different from my site to pops a confirm box, and if he confirm to execute an ajax script and then to close or change the window. I don't know how to do that. PS: I'm using jQuery.

Answers:

Answer
$(window).unload(function() {
    var answer=confirm("Are you sure you want to leave?");
if(answer){
    //ajax call here
    }
});

Just add your own alert/dialogue code to the function.

Answer
<script language="JavaScript">
  function unload() {
      alert('window closed');
  }
window.onunload = unload;
</script>

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