how to get rid of navtree - tab duplicates

Hi,

I'm trying to make a plone site with a couple of large sections, which can 
be accessed through the top tabs, and with the navigation tree only showing 
the contents of the folder that was accessed through a certain tab.
What I did was:
- create plone folders
- make corresponding tabs with site actions
But what happens then is that you get a tab _and_ a navigation tree item 
for that folder. The main Plone.org site has that too and I find it a bit 
confusing.

You can see what I would like to achieve in action at: 
http://plone-book.agmweb.ca/

It seems like something pretty straightforward, but I bought the book, 
sifted through the online documentation but I couldn't find a solution...

(I'm customizing a Plone site for a multilingual group of European history 
teachers for them to exchange heritage education experiences and so on.)

Thanks, mille grazie, danke, heel erg bedankt, in advance!
Sara





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