making 1 pdf file from 2

I hope someone here can help me because for some reason I can't receive any mail from the pdflib mailing list. I have PDFlib + PDI 5 using php to create my pages. This is the first time that I have had to do this and just can't figure it out. I have two files: ChurchCalendarFrontPage.pdf Church.pdf What I am trying to do is to have a page (cal.php) that someone goes to and it will create just one pdf document output with the two pdf documents. I can do it if I designate which page(s) that I want to display from each document, but they don't always have the same amount of pages. At the moment, the ChurchCalendarFrontPage.pdf has only one page and the Church.pdf has 13 pages to it. Hopefully someone here will know what I am asking for and be able to help me by either showing me where to go for examples, or show me the code for this. I am pretty new to PDFlib. Thanks in Advance Steve