They basically have to be very small sizewise. It's like 6 kilobytes max.
If you can get your image to no more than 90x90 pixels and save as a jpeg, it SHOULD be smaller than 6 kilobytes.
If you want to post the image in this thread, I can post it back to where you can save it and plug it into the forum.
A distinguished lurker.
Waiting on a Squeak, Pingo, and Cliptools with a Split Spring!