fog light switch

I have a foglight switch for my 97 vw jetta. I do not want to hook up fog lights per say, instead I want to use the switch to turn on the rear fog light. How would I go sbout doing this? I know I have to run a wire from the back of the car to somewhere up front either on the switch or some place else. I searched the internet and came up with nothing. I'm hoping you can provide some insight on this or even tell me how the fog light switch works. Thanks