in-forum advertising question

I note in the admin section there's a way to show an ad between the 1st and 2nd post in a forum.
Can that be done so that it's different for each forum?
Example - we have a big company that wants to "sponsor" a forum - they make brake kits to convert your cars drum brakes to disk, and they want to pay to "sponsor" the brake forum part of our forums. Their ad won't get much look in the Engine forum area, or the for sale section, but it's perfect for the brakes and suspension forum.
We also have a maker of decals and stripe kits that wants to sponsor the body and exterior forums.
So, we want the ability to have different advertisers for different forums.
Does this make sense??

This is how we do it currently, it's barely noticeable, not really very good, and all manual....

Suspension, Steering, Brakes & Wheels (3 Viewing) What makes it stop, turn, and smooths the ride...... Sponsored by Wilwood Engineering www.wilwood.com

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Scarebird disc conversion warning... By Amx68 Yesterday at 11:07pm

OK - I didn't think I saw a way .

Don't need to advertise engine parts to a fellow who is just changing a tire so was hoping for a way to "target" the ads based on the forum topic.
Will find another method, probably hand-code something in.

IF anybody else is looking to do this then you can find my tutorial here: Advert Per Forum

Any problems adapting it, then post on my support forum and I'll do my best to help.