function relativity_form_alter($form_id, &$form) {
    if (isset($form['type']) && $form['type']['#value'] .'_node_form' == $form_id && variable_get('relativity_type_'. $form['type']['#value'], FALSE)) {
      if ($node->parent_node) {
        if (is_array($node->parent_node)) {
          $form['parent_node'] = array(
            '#type' => 'hidden',
            '#value' => implode(',',$node->parent_node),
          );
        }
        else {
          $form['parent_node'] = array(
            '#type' => 'hidden',
            '#value' => $node->parent_node,
          );
        }
      }
      if ($types = variable_get('relativity_type_'. $form['type']['#value'], FALSE)) {
        $rnode = node_load($form['nid']['#value']);
        $output .= theme('relativity_links', $types, $rnode, 'edit');
        $form['parent_node_links'] = array( '#value' => $output );
      }
   }

}