Different Backgrounds moves w/ mouse

Guys, I have been trying to find this out but is impossible.The only way that I found is moving one background.

Ok, Here is the challenge:

Is there in the world any guru that knows how the background motion in http://www.stylewars.com/index3.html
was made??

**Now the ultimate challenge:
**and about the http://www.hollisterco.com/hol/flash/club_cali/clubcali.html
Go there and click archive, then click Venice beach…