будем ставить Lightbox 2

<script src="{tpl_url}/js/jquery-1.7.2.min.js"></script>
     <script src="{tpl_url}/js/lightbox.js"></script>

<link href="{tpl_url}/css/lightbox.css" rel="stylesheet" />

insert_thumb    =    "[img="{thumb_url}" border="0" align=""]{file_name}[/img]"  

insert_thumb    =    "<a href="{file_url}" rel="lightbox"><img src="{thumb_url}"  border="0" align=""></a>"

case 'title':
$v = str_replace(array("\"", ord(0), ord(9), ord(10), ord(13), ":", '<', '>', '&'),array("'",''),$kv);
$outkeys [] = $kn.'="'.$v.'"';
break;

case 'onclick':
$v = str_replace(array(ord(0), ord(9), ord(10), ord(13), "'", "\"", ";", ":", '<', '>', '&'),'',$kv);
$outkeys [] = $kn.'="'.$v.'"';
break;