Photoshop Help

I was wondering how do we make a folded page effect using photoshop as shown in the screenshot below

http://ezfiles.info/images/5844116.png (http://ezfiles.info/)

http://www.pixeldigest.com/folding_paper.html
:thumbsup:

Here is a real similar tutorial:

http://www.myjanee.com/tuts/curled/curled.htm

There are also some Photoshop plug-ins out there for page folds, but I don't endorse any of them.