WakeWorld - Volume Control Help for Helmet. Wiring guys

I want to wire a set of speakers in to my snowboard helmet which is essentially this:

http://www.amazon.com/Smith-Skullcan.../dp/B001IBD9TO

or below paint diagram.

I found a guy on ebay that is selling just the ear pieces with speakers inside. Now the one shown has a volume control on it already. The one I am getting does not and what I am wanting to do is wire a dial style volume control in to the side of my helmet which would be easier to use with gloves on then the rolling style and hangs loose.

I bought a 1K Potentiometer which is shown below. The question I have is
A) How to properly wire it?
B) From what I have looked in to this may only be good for one speaker and not both Left and Right at the same time?

Any help would be much appreciated. Otherwise I may see how I can incorporate a iPod headphone volume control in to the helmet instead.