I am sure many scripts like this already exist, but anyway, this was a response to this request I saw a while back: http://www.rpgmakervx.net/index.php?showtopic=37031 Since it is specifically to fulfill that request, don't expect it to be very customizable!
Features:
Independent book graphic for each book.
Book sound effect.
Unlimited books and pages allowed.
Window telling the pages you're on.
Displays two pages simultaneously.
Use script call for opening a book.
Display pictures (also unlimited).
Book title window on top.
The script is relatively easy to use, but it can become quite a mess if you're not organized enough! You make the books in the script. For more details, instructions, etc, download the demo! Demo Download: http://www.megaupload.com/?d=ALS8VDB0