pdf

Hi people! My question is slightly offtopic, but maybe someone could help me! After scanning a large book, i have a lot (2000+) of .pdf pages, so that each page is in its own file. Luckily, the name of each file is the number of the corresponding page in the book. Now i want all this stuff to be in a SINGLE .pdf file! Well, Adobe Acrobat can permit adding pages to a document manually (somewhere in menu, there is an option "add page" which adds 1 page to the document). But doing this job manually is slightly time-consuming (taking into the account the number of total pages!) I wonder how can coolect those pages in a one file, just playing around with a *.pdf format properties? That is does Adobe Acrobat provide kinda API functions to simulate "add page" actions? Thanks for any help! P.S. By the way, those demos yet available are very cool! Good job! C++ RULEZ!!!