The way that page is designed it is loading a new html page with an image that stretches the to the entire size of the page.
Jquery would probably be your best option here. The scroll-to feature may be what your after, this may be helpful [Jquery Scroll To](http://demos.flesler.com/jquery/scrollTo/ “Jquery Scroll To”)
Or you can also look for a parallax scrolling script to achieve a similar effect.
[Parallax Scrolling](https://css-tricks.com/forums/discussion/13370/parallax-scrolling/p1 “Parallax Scroling “)