[Zope] page numbers - how to do them?

How can I do page numbers in batch-processed pages? example layout as I am trying to do: <<back 1 2 3 4 (5) 6 7 8 next>> I can't see a nice way for this - am I going to have to do hacks like adding up the array-length of the previous-batches and next-batches variables? --- Julian Morrison Programmer (Zereau Ltd)