php/ajax question

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Hi gang:

I have a small php script that behaves differently depending upon who's calling it. The code is:

<?php session_start();   /* a.php  */
ob_start();
$_SESSION['var'] = "test";
ob_clean();
header("Location: http://www.example.com/b.php";); /* Redirect browser */
exit;			 ?>

If the code is called directly, namely http://www.example.com/a.php, then the $_SESSION var is filled with "text" and the redirect is realized.

However, if the php script is called via ajax:

-snip- preceding ajax

function sndReq(action)
{
http.open('get', 'a.php');
http.send(null);
}

Then the $_SESSION var is filled with "test", but the redirect is not realized.

Why can't the php script redirect the browser when called via ajax ?

Thanks.

tedd

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