insert one PDF file into another

I need to insert one PDF file into another PDF file, say, insert page 7
in another pdf file or insert page 7-12 into another.  I am looking for
a simple solution!!!!

 a)One freeware java library is etymon's PJ
  http://www.etymon.com/
(They have api's like java api. But there's a lot of programming to be
done and it may take some time to do it.)

 b)JavaPDF -- create pdf files and draw charts,graphs directly onto pdf
 http://www.dot.state.oh.us/javapdf/
(this is not what I am looking for)

 c)pdflib, activePDF, PDFfactory & pdfEverywhere- commercial products


Thanks in advance
Mathy


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