Wooo thank you I did it! :]
I made a change in the code where you said and it replace the @ for a picture
>> For Black, Brown, etc. backgrouds
and
>> For White, Yellow, Gray, etc. backgrouds
Just search the e-mail hack part in the code of /lib/gb.class.php and make the changes
/* E-mail Hack */
$row['email2'] = str_replace("@", "<img src='http://www.yoursite.com/images/arroba_white.gif'>", $row['email']);
$row['email'] = "javascript:getEmail('".$this->db->encryptEmail("mailto:".$row['email'])."')";