Please, it's not a problem at all!
Look here:
http://fancybox.net/api
In advanced options, the very first row:
type Forces content type. Can be set to 'image', 'ajax', 'iframe', 'swf' or 'inline'
I used iframe. It allows you to display text, links, images, etc.
Look how I did:
<script type="text/javascript">
$(document).ready(function() {
$("a[rel=example_group]").fancybox({
'width' : 900,
'height' : 600,
'autoScale' : false,
'cyclic' : true,
'hideOnContentClick' : false,
'imageScale'