Using Jquery and Ajax to overlay an image

Hey all i am trying to find out how this site seems to be using Jquery to overlay the wood floors/ 开发者_如何学Cwalls with whatever the user selects to a default image overlay.

Does anyone have any idea what type of jQuery plugin they are using to do this? It seems to just be calling an overlay-ed image on top of the default one?

http://boen.esignserver2.com/

Thanks!

David

This Site is using , Raphael Another JavaScript Library.

The larger Image on the right side is populated from Raphael.