One ad location to multiple VB forums??

[JohnnieOO]

I have three VB sites with essentially the same content but geographically separated. I wish to store all of my advertisements in one location but have them randomly placed on my all of my VB sites . I think I need one of two options (but this is out of my league, admittedly).
1 - A "temporary" storage that randomly rotates ads to a specific location "X" and have the VB sites reference to "X".
or
2 - Have a way to randomly (but equally) rotate from each VB site to the permanent storage.

Does anyone have any suggestions, mods, or system that will perform like this? Obviously, I would also prefer to track impressions, CTR, limit monthly impressions, etc...

Thanks,
Johnnie