Variable speed image slider

Hi ppl

I am hoping to create a nav device similar to that on the http://www.nike.com/jumpman23/xx3/ site. Find the circular nav thingy and move it left and right to move the environment in the background. See how it speeds up the further it gets away from the centre and slows down to a stop when gets back to the centre. I am not worried about the zoom effect but could anyone help me in creating the left and right movement. I am not much of a coder as I am graphic designer.

Thanks very much.

hey peeps. i know you guys can do it.

its based on the mouse position to the centre of the stage

gotoandlearn.com has a carousel example which uses the same code

however the above is specifically, press the mouse then move the mouse which is a bit more tricker to do