mp3 player through headphones in the car.?

Hello, I have a Zune mp3 player and I'm using a radio transmitter for your iPod that connects to your cigarette lighter and then run a wire to my headphone jack Zunes. (It is one of the two earphone cables expensive) How I can make an entrance which only goes to the radio input jack for headphone wires from both sides. I just want to build on the script then connect the headphones Allready in my Zunes the car-mounted input. I think there is anything I can buy, but I can not find it, can anyone help me. Thanks

Get a new deck with an auxiliary input.

HD ProClip USA Vehicle Mount System for Zune HD & Land Rover LR3

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