Oh yeah I remember that gif idea, I didn't know it was actually being seriously considered. Unfortunately, Photoshop CS whatever doesn't come with imageready anymore, so I couldn't help with that, you would have to figure something else out, like one of those online generators.
Unless anyone can make flashes, or turn .anis into .gifs, or could provide prepared images to somebody who would have a method of creating .gifs (mjn.maxael probably would).
And I realize it's a bit past the image captcha stage, and I might have actually seen this here, but check this out:

(via
http://strix.org.uk/ransom)