Photo Display Effect

Hi I was hoping someone might be able to give me some pointers where I can find
a script that creates the effect of a photo opening in full size (when
thumbnail is clicked) and fades out the rest of the window behind it - click on
any photos in this link and you will see the effect I want to implement

http://www.foodfullstop.com/supplier...es/2-69-0.html

many thanks

Oli