[support] template.php function called from a php block

[Dany V.]

I wrote a very basic function in template.php.  When I edit a page and
switch the input format to PHP, the preview works fine and I see the
result of the function call.  However, when I save the page, I get:

Fatal error: Call to undefined function: phptemplate_1()
in .../includes/common.inc(1342) : eval()'d code on line 32

This is my test function in template.php:

function phptemplate_1() {
  $output = '<h1>Doh!</h1>';

  return $output;
}

And there is only this on my page:

<?php
  print phptemplate_1();
?>

If I write the function in node.tpl.php, it works.  If I write the code
in a page and preview it, it works.  When I save the page, it doesn't.

I'm pretty sure this is a newbie mistake, include missing maybe?  I've
been reading about it, browsing but I couldn't find anything specific.
Any pointers?

Thanks.

-- 
Dany V.