WordPress sibling pages

Output siblings to the current page:

<?php

global $post;

$current_page_parent = ( $post->post_parent ? $post->post_parent : $post->ID );



echo '<ul>';

wp_list_pages( array(

	'title_li' => '',

	'child_of' => $current_page_parent,

	'depth' => '1' 

) );

echo '</ul>';

?>