First, thanks to Wayne Luke for his permission to release this. The link to the original.
http://www.vbulletintemplates.com/mods/showthread.php?t=5727&page=1&pp=14
This modification allows you to have linked forums appear as sponsors in subforums.
The default size for the images is 185*25. Images are named the same, ie banner_forumid.gif, where forumid is the forumid of the linked forum.