'*' Can Someone Identify How This Script Was Made?

Hey guys,

Just wanted to know how the following image flash displays were put together?

http://www.youtailor.com/configurator/shirt?yticarea=1st-row&yticteaser=pos02_masshemd-designen

Basically, when you select any fabric, item, button etc., the entire product displays updates along with it?

What particular knowledge / steps are require to create it?

How much would it cost to hire someone to code it?

i suppose they have for all parts of the cloth images and they stitch (is this the right word?) them together upon selection. But this is just my assumption, i am nowhere near making such a thing on my own.

But the site is real good. I've heard about it a long time ago but never thought about looking at it.