Mosaic

| → | http://buildinternet.com/project/mosaic/

So, what exactly does Mosaic do?

Automatically generates sliding boxes & captions
Allows slide & fade animations with custom directions
Preloads images within boxes

Implementation is fairly easy, a number of sample configurations in the downloadable file on the project page. It operates with two panels – an overlay and a backdrop. The content in the overlay gets repositioned according to the options that you provide.