Fire-bellied confusion

[Tropicok]

Went to a flea market today just browsing around and there was a pet vendor who had several frogs, a chubby and I forget the others. But there were several small green frogs with orange/red bellies and dark spots. I saw a picture of this frog in one of the albums earlier but can't find it now. This is not a Bombina but would like to know whether this is a tree frog or what? Is it a common frog in pet trade and how do you care for it? I hate to buy at a flea market and since I don't know the vendors at all I will most likely pass but my curiousity is killing me. The lady just said a fire-bellied frog.

[Kurt]

Was it a Kassina maculata?