you can switch the colors and its been done before by other forums. I dont think its in that part of the code i posted, but its possible.
http://forums.ifskinzone.net/index.php?showtopic=97214
They talk about it there, but it maybe on the server..... I had another forum though phpbbfree or something that actaully gave you 6 choices to pick from for color of the google ads. So i know that editing is possible