Shared database but Different Advertisers

[cowdude]

I have two different location based sites, i.e. the info on one is for MD and the info on the other is for TX.  The sites are:

http://www.cumberlandwatercooler.com
http://www.planowatercooler.com

It's a general & political discussion based website and with memberships settings I have adjusted it so people can read national issues and what not but not the local issues for the other site.

That brings me to the question.  I share a database @ godaddy.com with both sites because much of the discussion is not geographically specific.  I want to know if there is a way that I can put advertising that is germaine to the TX site on without it appearing on MD site.  Currently, any advertising shows-up on both.  Do I need to create a separate database for the advertising or can I mark it so the ads only appear on one site and not the other?

I have SMF loaded twice but use a shared database.

Does anyone have a solution?  I am new at this, one month old and you guys are stellar.  I am just trying to make this do what I think it can.  I just don't know how to get it there though.

Thanks in advance.

kurt