Host it in photobucket or another hosting site for images and animations, use the image code [ img ] url to animation [ /img ] (without spaces), and post it.
Save it as either a gif animation or png, and upload it. Photobucket only takes in jpg, gif and png, I think gif is the only animation-ending you can have, but I am not sure. Take the pivot and save it as a gif, then upload it to photobucket or imageshack.