Handling page numbers

Hello.

I'm trying to print the current page number of a purchase order
and the total pages concerning that document in every page.

Example: 1 of 10 in the first page,
2 of 10 in the second page, and so on.....

I don't know if this is possible to achieve because the report
is executed sequentialy and we only get the total number of pages at
the end of the process.

If anyone can give me a hand I would appreciate it.

Thanks.