cgi permissions problem: zip and delete

[Rory Campbell-Lange <rory@campbell-lange.net>]

I've written a perl cgi that zips directories of files placed on the
server over netatalk (file sharing for macs).

As the users login as guests to the mac fileshare, the owners of the
directories I want to zip (and then delete the originals) is "nobody".

The owner of the cgi process is www-data.

I'm keen to be able to get www-data to zip and delete nobody's files.
Should I be using sudo? I've made a temporary short-cut to allow
www-data to "sudo zip" as root which works, but sounds like an
unnecessary thing to do. Can I get around this by sharing groups between
www-data and nobody?

Sorry for the newbie question. I'm a mac user, and permissions still
seem strange.

Thanks for any help
Rory