Logican, I love this hack! it's exactly what we were looking for while re-designing our site. I've already clicked the 'install' button for ya, even though we're still in beta testing on the upcoming site relase! I'm that confident ath we won't see any problems with it.
Just and FYI, I did change your code in a couple of places, primarily to use the header and footer templates within our vb styles, but also to work with phpAdsNew. I know you have your copyright in your webtemplate footer, and we don't currently have something similar in in our vb footer templates, but that was the easiest way I found to allow our header and footer change with the user's styles. I am, however quite pleased with this hack, and will be giving you due credit in our 'Credits and Copyrights' page (which will probably be a webtemplate page
Keep up the great work....
I'm going to read through this thread to see what other info there may be in here.... possibly post some of the things we've created eventually....
Cheers!