backports and preseed and apt-proxy

[Martin Schulte <schulte-martin@web.de>]

Hi,
1.
i use preseed-files to install debian-lenny on several clients. I chose 
the gnome-desktop-enviroment. Is it possible to install openoffice3 from 
the backports directly with this method?

At the time i use a postinstall script, which removes openoffice2, and 
installs openoffice 3,

2.
I enabled 
-----
backends = http://backports.org/debian
-----
in the apt-proxy-v2.conf, but if I use the apt-proxy always openoffice2 
will be installed. If i use the http://backports,org/debian in the 
sources.list openoffice3 will be installed.

Thanks, Martin