Strange question. Is it a problem to write a couple of PHP or JavaScript lines that will implement a banner rotation algorithm?
e.g.:
PHP Code:
<?php
$banners = file("banners.txt");
srand ((float) microtime() * 10000000);
shuffle($banners);
$parts = explode("|", $banners[0]);
echo '<a href="'.$parts[1].'"><img src="'.$parts[0].'"></a>';
?>
There should be a "banners.txt" file which must contain the links to banners and paysites in the following format:
{path to banner 1}|{url 1}
{path to banner 2}|{url 2}
etc..
e.g.:
thumbs/banner1.jpg|http://www.sponsorsite1.com
thumbs/banner2.gif|http://www.sponsorsite2.com/