Flashy (but not flash) add to cart button

what’s the best way to go about creating a flashy/animated add to cart button like on this page without actually using flash???

please advise. thanks in advance!

Do you need that weird swoosh/lightning in there? If not, then I’d use plain CSS3 for the button. You could of course use an animated .gif as well.

yeah, i want the animation, with the swoosh/lightning.