First off, as a rule, these things only work if the image is a .jpg, .gif or .png image. (.jpg and .gif are the only ones you should concern yourself with, though. You can tell what kind of file it is by looking at the file extension.) Bitmaps (.bmp) won't work.
Second, the image should be 80X80 pixels in size or smaller. How to resize it will depend on what graphics-related programs are available on your computer, but it seems like all of them (MS Paint doesn't count) have a Resize Image option somewhere.
I know that all of this is probably a little vague, but I hope it's somewhat helpful. /images/graemlins/ohwell.gif
~Rochelle. /images/graemlins/Rose.gif