Redirection message seems nonexistant ?

[cinq]

This is the code I have:

PHP Code:

$url = "articles.php?action=viewarticle&artid=$artid";
 eval(print_standard_redirect('redirect_postthanks')); 


Basically, when a user adds a comment, he/she gets redirected back to the same article in which the comment was made.
However the redirect message that is supposed to show ( postthanks ... Thank you for posting! blah blah ) does not seem to take effect, instead seemingly whizzing back to the same article page.

Am I doing something wrong here ?