Help understanding how this technique is done

Have a look at this link...

http://sdpress.ho.ua/fragrance/

Can someone tell me HOW this works?  As you scroll down the image in the background changes and the content scrolls over the top of that image.  I think it's a really neat technique and would like to implement it but I have no idea how he/she is doing this.

Any help would be appreciated.  Thanks!
cdemott33Asked:
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QuinnDexConnect With a Mentor Commented:
<style type="text/css">

body{

background-image:URL('background.jpg');

background-attachment:fixed;

}

</style>
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