Another update

This one is kind of lame, cause there is very little to test, but here goes...

- I added a thumbnail to the "create listing" pages that shows the default graphic (Ben)

- I implemented separate ad tables for the various listing types.

- I re-implemented advertising in the search results, you won't see anything different though.

- I add ads to job and service listings.

What's coming next you ask... well. quite a bit of stuff, but it will all be focused on advertising, so you should not see too much for a while, but you should keep testing to verify that I don't accidentally break something.