How to create the google plus one button effect using jquery?

It is one image containing multiple frames. I assume The image is used as background via CSS and the background position is changed rapidly (through JavaScript) to create the animation effect.

The image is:

+1 button

It’s called sprite animation and is how Google animated the Martha Graham logo earlier this year. There are jQuery plugins like Spritely to assist with rolling your own sprite based animations. – Marcel Aug 7 at 8:06