[Zope] DTML namespace problem (was: dtml-tree issue)

Hello, i have focused my problem on this: having a Python Script "testScript": ------------------------------------ class obj: a = 1 b = 2 c = 3 return obj() ------------------------------------ and a DTML Document "testWith": ------------------------------- <dtml-with testScript> <dtml-var a> </dtml-with> ------------------------------- when i try to view the DTML Document, i get an "Unauthorized" Exception..... I believe this has something to do with the security mechanism of Zope. What must i return from the Python Script in order for the DTML Document to work? Thanks for any help