Open your picture in any decent graphics software and re-size it to something like... I don't know anyway not any larger than 75 pixels x 75 pixles and save as a .gif type file.
If you don't have any graphic software avalible or are having a difficult time with it. I can do it for you in a matter of moments. Email it to email@example.com and I'll email it back to you. Please remember, though, that I am at work and may have pressing business to attend to at times.