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there must be a template or something.
I see that kinda thing a lot.

yes, it is done with a template.

It's good to keep people who like pictures to stay on the page and not click away or lost interest.

The collection of the pictures is at the bottom or in a library/gallery and that 'jumpy' interface or presentation loops through your collection.

talking about template based websites, I have a few others just to have them around:

http://moneyworld.us/

http://zoomedin.org/

I think you'll like some of the videos there.