I am interested in running both AdSense and Yahoo Publisher Network ads on my forum. I would like it to randomly choose the advertiser for the page, then put up all ads on the page from the same publisher. For instance, one page view may show AdSense in the header and footer, and the next page view would show YPN in the header and footer. In no way would AdSense show in the header at the same time YPN shows in the footer. Has anyone seen a script like this? I am using vBulletin, but could potentially take a script for standard web pages and make any necessary changes for vBulletin. Thanks for your input!