Image click zoom

Hello,

I have a problem with my image viewing. When I click on any pic in the gallery it opens a new link and it doesn’t make a nice popup like the stock nirvana theme does…

Example: http://gpe.fs.um.si/beta/?page_id=29 – The pics get open in a new link.

http://demos.cryoutcreations.eu/wordpress/nirvana/cat/post-types/ – and not like here that if you click on a pic and a popup style image appears…

Tnx