Images open a new tab. HELP !

WordPress version: 3.5.1
NextGEN version: 1.9.6
Site: macarenabilbao.com
Hello.

I’m in really troubles with my cliens and I Need help. My problem is:

I need show the galleries at the bottom of this page (http://www.macarenabilbao.com/en/shop/kitchens/bam-kitchen/) (Lumbers and fabrics) in the same way this other page (http://www.macarenabilbao.com/en/portafolio-2/). I need to apply a gallery lightbox when you click on the image.

Now when you click on any image of lumbers or fabrics the image open a new tab!!

I’m really Frustrated.

I need some advices, thank you very much.

http://wordpress.org/extend/plugins/nextgen-gallery/