[pstricks] weird margins with a0poster

[maja zaloznik]

Hi!

First of all, when I say weird, I simply mean "I don't understand" (as one
does colloquially).

Here's my example:

 \documentclass[portrait, a0b]{a0poster}

\usepackage{pstricks}


 \begin{document}

\psframebox{

\begin{minipage}[c][10cm][c]{\textwidth}

text

\end{minipage}

}


 \psframebox[framesep=0cm]{

\begin{minipage}[c][10cm][c]{\textwidth}

text

\end{minipage}

}


 \begin{pspicture}(0,0)(\textwidth,10cm)

\psframe[linecolor=red](0,0)(\textwidth, 10cm )

\end{pspicture}


 \end{document}

Its a poster, so ideally one would want both margins to be equal? Which they
are not, but further more I'm not sure why a psframebox with 0 framesep is
still wider than a pspicture if they are both \textwidth.

Oh, I'm using LaTex+dvips+ps2pdf and in case its just me, here is what I
get:

http://www.mediafire.com/?c2430s823zhcxwx

(not sure I can attach files, so I won't try).

I'm making a poster using pstricks and ideally I want to use \textwidth a
lot, so I would really appreciate any pointers. I also realise this is not
purely a pstricks question, but a0poster.cls seems really straightforward,
all the margins and separators are set to 0, so I don't understand why it
isn't symmetrical!

Thanks and sorry if this is too newby-ish!

Maja.
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