Gateway ad page with cookie

[Camz]

I don't found any hack or modification like:

i would like to display a page each day to my member, and in this page i will have a big ad.

Can someone can help me?

I tried to put this file on my showtread.php - forumdisplay.php

<?php

ob_start();

if(!isset($_COOKIE['pub'])) {
setcookie('pub','1',time()+86400);
header('location:http://www.mysite.com/adpage.htm');
}

ob_end_flush();

?>

but sometimes i have a blank page... Don't know why. Any better solution?

I don't found any hack or modification like:

i would like to display a page each day to my member, and in this page i will have a big ad.

Can someone can help me?