3D curl

Hey, so I saw a nice effect done on a website template a while back. I wanted to use a similar effect on another website so I finally decided to download the source and see how they did it, expecting some actionscript. But all I got was an image sequence, here is a selection of snaps:

I temporarily hosted it on http://www.lg-iraq.com/pagecurl.jpg

I bought a filter for photoshop, which did the page curl great, but it doesn’t animate plus the perspective wasn’t what I wanted. Played around in After Effects, managed to get a flip but without a curl. Played around with Swift 3d, but that also didn’t seem to work too well. From the fact that its an effect used on a flashloaded template, I’d assume that it was a prebuilt effect in some program (or it could be an effect they have saved and use as a designer resource). But I’m really stuck as to the best way to achieve this effect, if anyone knows I’d be greatful.