[Zope] NotFound (404) and Unauthorized (401) error page redirects

[Kamal Gill]

I need some advice on how to create an Unauthorized (401) error page 
redirect.

I've discovered how to create a NotFound (404) error page redirect by 
adding the following code to the top of the "standard_error_message" 
DTML method, which is located in the root folder...

<dtml-if "error_type=='NotFound'">
<dtml-call expr="RESPONSE.redirect('/notfound.html', lock=1)">
</dtml-if>

However, when I replace 'NotFound' with 'Unauthorized' (--please DO NOT 
try this on your production Zope server--), anyone who tries to log 
into the Zope management interface (ZopeServer/manage) is redirected to 
the unauthorized page.

Basically, I need to know the Zope analog of Apache's "ErrorDocument 
401 /unauthorized.html" directive.

Many thanks.
  - Kamal