[Zope] problem with ads.py

[WWW Admin]

hi,

i'm currently reading through the "A Technical Introduction to Object
Publishing with Zope". included in this interesting read is an example
ads.py. 

when i execute ads.py via the shell i get no complaints however when 
i try to add ads.py as an external method in zope with the following
paramaters

Id:			adflipper
Title:	
Function name:	
Python module file:	ads

and click on the add button i get this error message:

"The specified object, was not found in module, ads."

ok, so i tried calling some of the functions inside ads.py by entering
them in Function name: but i basically got the same complaint. this is
the first time i fooled with external methods so i'm probably making 
some very basic mistake but unfortunately i can't seem to figure out
what it is. 

i put ads.py into the extensions folder.

thank you to all who have provided answers to my questions in the
past!

regards,

mark

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