implementing images in DocBook

Hi,

near desperation I扉e got a problem with my documents in DocBook (just 
starting to use this tool for company愀 documents):
every tag concerning images (imagedata, guiicon etc.) is acceptede by 
Jade without complaints. Neverthless the rtf-file is never displaying 
any images.
I tried with different formats: no chance.
E.g.: the syntax as I惴 using it:

<figure><title>The Command Menu after starting 
<trademarkclass="registered">PetroMod</trademark>.</title>
<mediaobject>
<imageobject>
<imagedata fileref="figures/CommandMenuAfterStart.jpg" format="jpg">
</imageobject>
</mediaobject>
</figure>

What am I doing wrong?
Every idea is welcome!

Some additional information:
- OS: Windows XP
- DocBook V3.1

Thanks a lot

		Wolf
-- 
=======================================================================
Dr. Wolf Rottke
- I E S -
Integrated Exploration Systems
Bastionstrasse 11 - 19
D-52428 Juelich
Germany