как показать всплывающую подсказку, включающую миниатюру и выдержку при наведении ссылки на сообщение в другом сообщении

Есть ли способ вызвать миниатюру и выдержку для ссылки на пост в другом посте WordPress? например, при наведении на ссылку на сообщение в других сообщениях отображается всплывающая подсказка с миниатюрами и выдержками. нравится этот сайт:http://www.phonearena.com/news/2015-model-year-Toyota-Camry-to-have-wireless-charging-available-as-an-option_id55566

я попробовал с «https://wordpress.org/plugins/rb-internal-links/плагин.
в строке 114 rb-internal-links.php
я добавляю эту строку для вызова изображения:

$image = get_the_post_thumbnail( $post->ID, 'thumbnail' );

но это не работает.

<?php

/*

RB Internal Links
==============================================================================

Link to your other blog posts without having to use the full url, just in case anything changes later on!

Info for WordPress:
==============================================================================
Plugin Name: RB Internal Links
Plugin URI: http://www.blograndom.com/blog/
Description: Link to other blog posts and pages without specifying the full URL. Uses a UI to ease finding the post or page you want to link to.
Version: 2.0.16
Text Domain: rb-internal-links
Author: Arron Woods
Author URI: http://www.blograndom.com

Copyright 2009  Arron Woods (blograndom.com)  (email : [email protected])
==============================================================================

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/

/**
* Core class for RB Internal links
*
* Sets up hooks, core methods, etc
*/
if (floatval(phpversion()) < 5)
die('You must have PHP version 5+ to use RB Internal Links');

с уважением.