function bbp_merge_topic_form_fields() {
?>

	<input type="hidden" name="action"       id="bbp_post_action" value="bbp-merge-topic" />
	<input type="hidden" name="bbp_topic_id" id="bbp_topic_id"    value="<?php bbp_topic_id(); ?>" />

	<?php wp_nonce_field( 'bbp-merge-topic_' . bbp_get_topic_id() );
}