destroy sessions on closing browser tab

[vinpkl]

hi all

just joined.

i have my lougout.php which destroys sessions and session ids on logout. I want to have same effect means i want to call this logout.php script when the user closes the "browser tab".

as these are the days of "browser tabs" so this is very important for me.

when the user closed the whole browser then all session and session ids are destroyed automatically
but these sessions are not destroying when the user closes the "browser tab".

Its not possible with javascript but its possible with AJAX. I have not used ajax uptil now and have no knowledge. So it would be great if somebody helps me with calling my logout.php script on closing "browser tab".

<? require_once("config.php");
$unique_id = session_id(); 
session_regenerate_id();
$qry="delete from cart_table where unique_id='$unique_id'";
mysql_query($qry);
$_SESSION = array(); 
session_unset();
session_destroy();
header("Location:index.php"); 
?>

vineet