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

2  
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