How can I get my background to stay in one specific place?

Like this website...change the size of your window and watch how he stays in the same location in relation to the content/body.

http://www.jamieoliver.com

and others, the background is always in the same position no matter the size of the screen.



Thanks!How can I get my background to stay in one specific place?
Using Divs and CSS



http://w3schools.com/ -- plenty of web knowledge here

http://w3schools.com/css/css_examples.as