Type of file for Catalyst

Ok I am a true newbie to the catalyst. Unfortunately in the theatre I just started in, there is no training or manuel for the catalyst. I have figured out alot and have used the files that came with it. Now I want to insert custom files that I will create with Photoshop. So here is the question..

What is the file type that will best read on a catalyst? jpg, bmp, gif?

I am not a Mac user so I don't know if they have a specific format.

Thanks in advance
Darrell