Sterling effort, gentlemen!

The perplexing thing is those images in the middle of the page. It's like those 'before/after' images where you slide the line across the two images to reveal one and hide the other.

Here's an example.

http://thenewcode.com/819/A-Before-A...ntrol-in-HTML5

Except here, it is happening with the page scroll - which I think is clever and looks real cool!

Perhaps the above example sheds a clue?