[themes] Corralling a stray button

[Jeff Greenberg]

In D7, in template.php, I'm hooking preprocess_page and setting a $vars[]
variable = theme_button.

In a block, I have this:

<?php global $signup_button; ?>
<div id="signup"><?php print $signup_button; ?></div>

The button appears in the page source outside of those enclosing divs.
 What am I doing wrong?
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