Gallery - image swap type (not lightbox)

Hi - trying to create a gallery with one large image and rows of thumbs underneath - clicking on a thumb will swap the big image to that one. Don't want a lightbox effect. The gallery on this page is exactly what I'm trying to create;

http://www.crabtreeandcrabtree.com/Barley_Hill_Cottage-propertyid:42977

Any suggestions? Have looked at nextgen but can't seem to achieve this (but it could just be me...!)