Psst ok then I'll tell you but it is strictly a secret between you an dme ok?
It's an animated gif.
Jsut get a few pics and resize them down to the right pixel size and then put them in a program that will make them into an animated gif. I think I used Animation shop (or something? comes with photoshop) but I am using my parents dodgey computer right now so I couldn't tell you for sure.
I think there are other animated gif programs that you could use.
I'm not sure which avatar is up at the moment because again - dodgey paretnal computer, but if it is the one without the writting then you can also use the animation program to do"transistions like clock wipes satuation fade etc...