This video will show you how do do switches similar in configuration to the way Madcow does his, with parts from the store.

As I stated in the video, Madcow's specific system is a proprietary design, and is NOT what I am going to cover. As I hinted in the video, I happen to know what's involved, and it is involved and incredibly easy to screw up.

So, here it is:

http://youtu.be/an_nX74Ljtc