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This Feature is on the ToDo List for the newbb, but also for the Core Function, so a Sitewidth Solution is the Best Solution I guess.
We also working on a PDF Solution see:
http://forge.xoops2.org/modules/newbb/viewtopic.php?topic_id=115&forum=21&post_id=598#forumpost598
and press the PDF Icon
Greetz Predator