What could be the best way to check if a user is disconnects?

I was thinking of  this

     <script type="text/javascript">
       $(document).ready(function()
{
    $(window).bind("beforeunload", function() {
*        call a controller function to set the user as offline*
    });
});
     </script>

but this is not perfect because when the user moves to another URL inside
the same app this event keeps getting triggered on url change.
Any better ideas?


Regards
António

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