added:

From d2m Fri Apr 22 03:39:36 -0700 2005
From: d2m
Date: Fri, 22 Apr 2005 03:39:36 -0700
Subject: 
Message-ID: <20050422033936-0700@zopewiki.org>

you need to use the 'structure' directive to suppress html-escaping: tal:replace="structure python:here.My_Script(...)"

btw: the right place to ask questions on zope programming is the zope-mailinglist ( more info at ZopeWiki:Lists )