Modificar Plugin

Hola gente del foro, le comento que agregue el plugin Author Exposed a mi blog. Tengo la necesidad de modificarlo, como podran observar en esta imagen en la información del autor del post, aparece el avatar, aqui esta el problema. El avatar que aparece es de gravatar, y mis usuarios no lo utilizan, para su imagen de avatar utilizo el plugin Simple local avatars, que permite a cada usuario subir su propio avatar.
A la hora de modificar Author exposed, no puedo lograr que aparezca el avatar que los usuarios suben, si alguien me pueda dar una ayuda con el codigo se los voy a agradecer, a continuación el código de author exposed:

<?php
/*
Plugin Name: Author Exposed
Plugin URI: http://colorlightstudio.com/2010/06/01/wordpress-plugin-author-exposed-v-1-1/
Description: Simple and elegant way to get more information about author.
Version: 1.1
Author: Igor Penjivrag
Author URI: http://colorlightstudio.com
*/

/*  Copyright 2008  Igor Penjivrag  (email : igor@colorlightstudio.com)

    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
*/

function author_exposed() {
	global $authordata;
	$nick = get_the_author();

// Gravatar Photo

	$mail = get_the_author_email();
	$gravatar = 'http://www.gravatar.com/avatar.php?gravatar_id=' .md5($mail);

// Get ID for hidden DIV

	$div_id = 'a'.get_the_ID();

// Hidden DIV output

	$author_posts_link = get_author_posts_url($authordata->ID, $authordata->user_nicename );

	$hidden_div = '<span id="'.$div_id.'" class="mydiv" style="display:none;"><img src="'.$gravatar.'" alt="gravatar" /><span class="ae_close"><a href="javascript:;" onmousedown="toggleDiv(\''.$div_id.'\');">cerrar</a></span><span class="ae_top"><b>Autor: '.get_the_author().'</b></span>
		<span class="ae_body"><b>Nombre</b>: '.get_the_author_firstname().' '.get_the_author_lastname().'<br /><b>Email:</b> '.get_the_author_email().'<br /><b>Sitio:</b> <a href="'.get_the_author_url().'">'.get_the_author_url().'</a><br /></span><span class="ae_about"><b>Mensaje:</b> '.get_the_author_description().'</span><span class="ae_body"><a href="'.$author_posts_link.'">Mas Juegos de '.get_the_author().'</a> ('.get_the_author_posts().')</span></span>';

// Show it

	echo ('<a href="javascript:;" onmousedown="toggleDiv(\''.$div_id.'\');"><b>Autor: </b>'.$nick.'</a>'.$hidden_div);

}

// Hook

	add_filter('the_author_posts_link', 'author_exposed');  

// Add JavaScript and Styles to header

	add_action('wp_head', 'add_head');
	function add_head() {
	echo '<script type="text/javascript" src="'.get_option(siteurl).'/wp-content/plugins/author-exposed/javascript/skripta.js"></script><link rel="stylesheet" href="'.get_option('siteurl').'/wp-content/plugins/author-exposed/css/ae_style.css" type="text/css" />';
}

?>