Help with Paint/CFG Edit

Here's the problem guys. Today, I decided to start working on my detailed and semi realistic overhead for my Mike Stone Jetstar 2. I had downloaded every Jetstar cockpit photo I could find from airliners.net. I had a full overhead pic which I trimmed down to make a decent fitting window within FS. When I opened CFG Edit and selected the .bmp I made I got an error message from CFG Edit stating "bad bitmap". It wouldn't let me use what I had created from the photo. I know its possible, I already did it with a CRJ overhead pic wich I modified the Premier Crj with in order to get the start panel and other controls off the center ped. and on the overhead where they're supposed to be in the real plane. Now, can anyone offer me any ideas why CFG Edit did not like the photo bitmap I had created for the Jetstar? Thanks a bunch.