bp_ps_update_meta( $form,  $post )

function bp_ps_update_meta ($form, $post) {
	if ($post->post_type != 'bp_ps_form' || $post->post_status != 'publish')  return false;
	if (empty ($_POST['options']) && empty ($_POST['bp_ps_options']))  return false;

	$old_meta = bp_ps_meta ($form);

	$meta = array ();
	$meta['field_code'] = array ();
	$meta['field_label'] = array ();
	$meta['field_desc'] = array ();
	$meta['field_mode'] = array ();

	list ($x, $fields) = bp_ps_get_fields();

	$codes = array ();
	$posted = isset ($_POST['bp_ps_options'])? $_POST['bp_ps_options']: array ();
	if (isset ($posted['field_name']))  foreach ($posted['field_name'] as $k => $code)
	{
		if (empty ($fields[$code]))  continue;
		if (in_array ($code, $codes))  continue;

		$codes[] = $code;
		$meta['field_code'][] = $code;
		$meta['field_label'][] = isset ($posted['field_label'][$k])? stripslashes ($posted['field_label'][$k]): '';
		$meta['field_desc'][] = isset ($posted['field_desc'][$k])? stripslashes ($posted['field_desc'][$k]): '';
		$meta['field_mode'][] = bp_ps_Fields::valid_filter ($fields[$code], isset ($posted['field_mode'][$k])? $posted['field_mode'][$k]: 'none');

	}

	update_post_meta ($form, 'bp_ps_options', $meta);

	return true;
}