Mad Magazine mimic Interactive Page folding help

Hi there,
Can anyone help me with trying to mimic the Mad Fold-ins from Mad Magazine in Flash?
Here is the best example of the interactivity that I would like to achieve:
http://www.nytimes.com/interactive/2008/03/28/arts/20080330_FOLD_IN_FEATURE.html?_r=1&
Please help if you can or start me off in the right direction.

Much Appreciated.