gistfile1.php

<!-- START Mark's [Sub]Page Tree Drop Down Box -->
<form action="<?php bloginfo('url'); ?>" method="get">
<?php wp_dropdown_pages(array(
	'depth'            => 0,
	'child_of'         => 0,
	'selected'         => $post->ID,
	'echo'             => 1,
	'name'             => 'page_id' )); ?>
<input type="submit" name="submit" value="Go" />
</form>
<!-- END Mark's [Sub]Page Tree Drop Down Box -->