What is this called?

[RazzberryGirl]

I'm trying to figure out how they do that effect where the movie goes forward and backward depending upon where the mouse is like on this website.

http://www.fluent.ws/main.htm

I'm having a doozy of a time trying to find a tutorial probably cause i don't even know what it's called or what section to look under. Can anyone help?

[RXGX]

It's a picture scroller that moves based on the mouse's location.

There's a dead area in center, and if you move +x or -x from 0 [center dead area] the items move faster and faster the more +x or -x you move the mouse from 0.

For example:

mouse is 10px from center, moves fast
mouse is 20px from center, moves 2x faster
mouse is 30px from center, moves 8x faster