Pivot animation

ok well basicly now i am pondering how to do 2 effects, one of which has already been posted here http://www.kirupaforum.com/forums/showthread.php?s=&threadid=41939
, and the other is like a folded piece of papper then it animates to swing up. kind of like opening up a comic book but with out all the other pages. if anyoen could link me to a tutorial or walk me though this tha would be great ,thanks.

ok well i got my 2 pieces lined up and when i try to make the closing effect it is like, they dont close properly it un aligns or something, could this be a problem with my pivots or something?