I'm trying to customize a wordpress page to include an iframe which give the users a link to there download. We're using wordpress 2.9.2 with the Thesis theme 1.51. I've been trying to use thesis hooks but appears that the php is stripped from the output. Help? Suggested alternatives?

Code from custom_functions.php:

    function add_ejunkie_download_link () {
is_page('slug-url-of-page') {
?>

<?php
echo '<iframe src="https://www.e-junkie.com/ecom/rp.php?noredirect=true&client_id=CID&txn_id=' . htmlspecialchars($_GET["txn_id"]) . '" width="100%" frameborder="0" height="50px"></iframe>';
?>

<?php
   }
}
remove_action('thesis_hook_custom_template', 'thesis_hook_custom_template');
add_action('thesis_hook_custom_template', 'add_ejunkie_download_link');