If you only want audio, get a USA Spec SVG-707. It opens up and uses the RSE input, excellent sound quality.
http://www.audiooutfitter.com/store/SVG707
If you need video from your laptop and you have RCA video out or an adapter, get one of these...
http://www.audioandvideointerfaces.c...-detail-GM.htm
You don't want to try to read text on the nav screen, but if you want watch videos on it, it does a pretty good job.
Use both together if you want audio and video.