[scribus] page order in my booklet

[Jean-Louis Cordonnier]

I want to print a little book : 24 pages, A4 (i.e. A3 folded).

My *.sla file is like this :

pages
x    1
2    3
4    5
...
22    23
24    x

In order to print it (on A3 paper) with a photocopier I need to have
recto : 24    1
verso : 2    23

recto : 22    3
verso : 4    21

etc.
Is it possible to do this with scribus in an easy way ?
Or must I use pdfedit, pdftk or ??? on my *.pdf file ?

Jean-Louis