Help with define pages using zen_redirect()

[skipwater]

Maybe some one can help me with zen_redirect() will not work.
Using define pages with this if statment:

  if ($answer == false) {
    zen_redirect(zen_href_link(FILENAME_DEFAULT));
  } 

I have placed it in my /includes/templates/my_template/templates/tpl_test_default.php
and also tried in /includes/languages/english/html_includes/my_templates/define_test.php

Both give me the following error when zen_redirect() tries to run:
PHP Warning: Cannot modify header information - headers already sent by
(output started at \includes\templates\my_template\common\html_header.php:22)
in \includes\functions\functions_general.php on line 44


Skip

[DrByte]

You cannot do a redirect from a template file (and define-page files are loaded as part of template content), because it has already started output on the page. You'll have to do your redirect in a module file somewhere instead.

[skipwater]

Just what I needed to know.

Thanks