Ok, I haven't really seen what images that you have going, but you make an animated GIF first. Once you have the animated Gif, you upload it to a webpage somewhere. Once you get the image where you want it, you just point to it with (image=http://www.whereverpicis.com/image.gif) I find that the best way to do this is to load up the webpage that I am uploading the GIF to and right click on the image. Then I select properties. This will show you where the EXACT location of your image is at. You just cut and paste this into the (image=pastehere). Now, I am using parenthesis there, but you need to put it into brackets []. Also, you will need to go to your profile and modify it. At the bottom of this there is your signature. Just put the whole image thing there and it should show up. If you are having a hard time with animated GIFs, you can locate someone that can host it for you, or you can "borrow" there pics. I am using one from
http://www.planescape-torment.com You can use any animated GIF.
Mine is []image=http://www.planescape-torment.com/images/SP_Horror.gif[] But again, you don't close the bracket at the beginning, nor do you open it at the end like mine. Play around with it and you'll figure it out. That's how I did it. Jon pointed me in the right direction too, and so did Memnoch. We have a lot of helpful people around.