shuffle by imposing....

[Luca Ferrari]

Hi,
I've got a document written with OpenOffice Writer, and I need to print it as a 
little book (two A5 pages within an A4 page, both sides), the problem is that 
I need to mix and match pages: the first with the last, the second with the 
second to last, and so on....
Now, I believe this technique is called "shuffle by imposing", but I'm not able 
to find any way to do it from OO Writer. Can anybody give me a clue about how 
to achieve this?

Thanks,
Luca