btw, our themes work great with fancybox (fancybox.net)
1. download fancybox jquery files from fancybox.net and upload them to your domain's root directory
2. open header.php file from theme's directory and paste following code inside HEAD tag:
Code:
<!-- Add jQuery library -->
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.7/jquery.min.js"></script>
<!-- Add mousewheel plugin (this is optional) -->
<script type="text/javascript" src="/fancybox/lib/jquery.mousewheel-3.0.6.pack.js"></script>
<!-- Add fancyBox -->
<link rel="stylesheet" href="/fancybox/source/jquery.fancybox.css?v=2.0.6" type="text/css" media="screen" />
<script type="text/javascript" src="/fancybox/source/jquery.fancybox.pack.js?v=2.0.6"></script>
<!-- Optionally add helpers - button, thumbnail and/or media -->
<link rel="stylesheet" href="/fancybox/source/helpers/jquery.fancybox-buttons.css?v=1.0.2" type="text/css" media="screen" />
<script type="text/javascript" src="/fancybox/source/helpers/jquery.fancybox-buttons.js?v=1.0.2"></script>
<script type="text/javascript" src="/fancybox/source/helpers/jquery.fancybox-media.js?v=1.0.0"></script>
<link rel="stylesheet" href="/fancybox/source/helpers/jquery.fancybox-thumbs.css?v=2.0.6" type="text/css" media="screen" />
<script type="text/javascript" src="/fancybox/source/helpers/jquery.fancybox-thumbs.js?v=2.0.6"></script>
<script type="text/javascript">
$(document).ready(function() {
$('.gallery a').fancybox();
});
</script>
thats it, enjoy
upd: make sure your gallery thumbnails are linked to .jpg files, not to attachment page