Stopping POSTDATA from being resent?

[Ghostu]

I made a comment script where users can type their comment into a form and then press submit to add it to my database. It works fine except for that if a user submits a comment, but then refreshes the page, the POSTDATA is resent and then the comment is posted again. So everytime the page is refreshed the same comment is added. What can I do about this?
Heres the script in action: [url=http://photoshopandyou.com/tutorials/view.php?action=view&id=7]http://photoshopandyou.com/tutorials/view.php?action=view&id=7[/url]
And the code:
[code]//Comments
//The date
$date = date('F jS, Y g:i a');
//Variables
if(isset ($_POST['submit'])) {
//Simplifying the variables.
$title = $_POST['title'];
$name = $_POST['name'];
$email = $_POST['email'];
$message = $_POST['message'];
//Checks for empty fields or invalid date.
if((empty($title)) OR (empty($name)) OR (empty($email)) OR (empty($message))) {
echo "<center><strong>Please fill in all fields!</strong></center>";
} else {
//The MySQL query which will insert content into the table.
mysql_query("INSERT INTO tutorial_comments (ID, tutorial_id, title, date, name, email, message) VALUES ('', '$id', '$title', '$date', '$name', '$email', '$message')") or die(mysql_error());
echo "<center><strong>Comment added!</strong></center>";
}
}[/code]
Thanks.

[Wintergreen]

Instead of your 'Comment added!' line, do
header('location:wherever.php');

That should fix it

[Ghostu]

Thanks alot, that works, but one last question how would I use that to direct them back to the page they left the comment on?
Thanks again!

[Wintergreen]

Just change the wherever.php to the name of the page you want them to go to and that should work

[Ghostu]

Thanks man it worked, the sites dynamic so had to use some extra code like this:
[code]$page = $_SERVER['REQUEST_URI'];
$host  = $_SERVER['HTTP_HOST'];
$extra = $page;
header("Location: http://$host/$extra");[/code]