If I'm photographing a book as single pages and I want to then attach pages 1 and 2, 3 and 4, so that it will be displayed as a book, how do I batch that for a bunch of files so that I can point an action to a folder of 200 files and just leave it to get on with it?

Any ideas?

I just can't work out how to make an action pick pictures 1&2 then 2&3, etc.