the mirror tab and main tab images are your tabs at the top of your forum (Home, Search, Profile, etc). If you want those images to be different you will have to make your own or find images that the author will let you use.

The only thing I see wrong with it, is the little "gap" on the right hand side of the mirrored image. You just need to change the px width or the background color in the css code for those.

the gap is gone now..looks like you got it fixed  . Other than that, I dont see a problem with the images. In your other post, what "bug" were you referring to?