Simple load a gravatar php

Gravatar.php

<?php 
//Simple load a gravatar php.
function gravatar($email = '', $rating = 'pg') {
    $default = "path/to/defava.png"; // Set a Default Avatar
    $email = md5(strtolower(trim($email)));
    $gravurl = "http://www.gravatar.com/avatar/$email?d=$default&s=60&r=$rating";
    return '<img src="'.$gravurl.'" width="60" height="60" border="0" alt="Avatar">';
}
?>