Hello, I have two questions:

1. Is there an easy way to combine pdf files not only one "after" the other, but also one "next to" the other? For example, If I have one-page files called a1.pdf, a2.pdf, a3.pdf, a4.pdf, b1.pdf, b2.pdf, b3.pdf, b4.pdf, c1.pdf, c2.pdf, c3.pdf, c4.pdf, I want to combined them so that I can scroll down from a to c and scroll right from 1 to 4. That is, I want to merge them in "matrix form". If I zoom out the final file should look like:

a1 a2 a3 a4
b1 b2 b3 b4
c1 c2 c3 c4
(TWELVE pages in total)

Is this possible? I tried Google but found no information.

2. Also, is it possible to just put all of them together in a single page. If I zoom out the page should look like:
a1a2a3a4
b1b2b3b4
c1c2c3c4
(ONE page in total)

Thanks

Note: I would like to do this for many one-page files

If you can't find a 'simple' tool to do it, you may have to create your own using Perl http://search.cpan.org/search?query=pdf&mode=all, prob this module http://search.cpan.org/~cdolan/CAM-P...lib/CAM/PDF.pm
If you go this route, I'd also post the qn at perlmonks.org; it's where the Perl gurus hang out and you should get some good advice/code.