screen_title help

I have a bit of a problem finding the files responsible for:

[% screen_title || self.class_title %]

This appears in the basic template and creates tags like this:

<a href="index.cgi?action=search&search_term=ToDo">ToDo</a>

I would like to be able to edit this to create a url like this

<a href="index.cgi?action=search&amp;search_term=ToDo">ToDo</a>

Small chnage, but important to me.

Where can I mak this change?
-- 
Christian Smith
Customer Service
Dynamic Network Services, Inc.
http://www.dyndns.org/