RapCore,
так работает ...
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title>demo</title>
<script type='text/javascript' src='http://code.jquery.com/jquery-1.9.1.js'></script>
<link rel="stylesheet" type="text/css" href="http://fancyapps.com/fancybox/source/jquery.fancybox.css">
<script type='text/javascript' src="http://fancyapps.com/fancybox/source/jquery.fancybox.js"></script>
<script type='text/javascript' src="http://fancyapps.com/fancybox/source/helpers/jquery.fancybox-thumbs.js"></script>
<script type='text/javascript'>
$(function()
{
$(".fancyboxmain").fancybox({ type: 'iframe'});
});
</script>
</head>
<body>
<a class="fancyboxmain" href="http://fiddle.jshell.net/kn3Qu/368/show/" rel="i am fancyboxinfo">go fancyboxinfo</a>
</body>
</html>