[Dan]

PHP Code:

$data[] = "banner1";
$data[] = "banner2";
$data[] = "banner3";
$data[] = "banner4";
$banner = array_rand($data);
// print out whatever with $banner in it 


In 3.0.7 that would go into phpstart_include I think and global_start in 3.5 but not sure.

PHP Code:

<?php echo $data["$banner"]; ?>

And that should echo out the url to the banner you want.

Tada!