Can someone explain how this site does this cool thing?
http://www.spiderball.com/index.php

move your curser around and the background moves around. 

Can someone explain how this is done? (what scripting or programming language do they use?) And is there an off the shelf script that can do this for my site?

thanks
Can someone explain how this site does this cool thing?
===

http://www.spiderball.com/index.php

move your curser around and the background moves around. 

Can someone explain how this is done? (what scripting or programming language do they use?) And is there an off the shelf script that can do this for my site?

thanks