php/ajax question

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 -- ------- http://sperling.com http://ancientstones.com http://earthstones.com