[Zope] navigation_tree_slot

[Asad Quraishi]

I'd like to use the navigation tree slot to navigate the portal.  Except 
that I want 'Documents' meta types (I think that's what they're called) 
to show up in the tree view when I click on a folder they are in.  I 
don't want those with id index_html to show or other types I may choose 
to exclude.  I should be able to allow the other types explicitly if I 
wish (images, files for ex.).

I've modified a custom version of navigation_tree_slot.pt to allow 
anonymous users (and others) to view the folders as per a How-To.

I've looked further at navigation_tree_slot.pt and it doesn't look like 
I can do it(show docs in the tree view) from here.

Do I need to modify navigation_tree_builder.py?  How do I do this (I 
know a little python)?

Any help would be greatly appreciated.

- Asad