How to compile multiple single pdf files to one book?

I have scanned in some pages and saved them as pdf file. How can I can make all scanned in pages into one pdf document? bye Ronald -- Ronald Wiplinger (CEO of ELMIT) http://www.elmit.com +886 (0) 915 653-452 - I'm a SpamCon Foundation Member, #694, Verify it at http://www.spamcon.org