[SceptileMaster]

There have been a few topics about this subject before. Nagoyankee has said that じゃありません is not/very rarely used. Now that I have a formal Japanese teacher (it's not a greatly difficult course quite easy so far, nothing I didn't know, but I need a high school level foreign language qualification to get into Japanese at university) she said じゃありません is not uncommon. She is also a native speaker. So I think either may acceptable.