How can I order metaboxes in my posts in WordPress?

                        <?php
$ck = get_post_custom_keys($post_id); //Array
    foreach ($ck as $k) {
         if (substr ($k, 0, 1) == '_')
         {   // skip keys starting with '_'
             continue;
         }
         $cv = get_post_custom_values($k, $post_id );  //Array
            foreach ($cv as $c) {
                if (empty ($c))
                {   // skip empty value
                    continue;
                }

                echo ($k . ': ' . $c . '<br/>');
            }
    }

?>