guy, need your help. Has anyone installed a headrest dvd for your car? I want to buy a headrest car dvd, but I am worried that I can't handle the installation issue. Whether it is too hard to install? Also need your advice about the headrest dvd I am going to buy, is that good? http://www.justcardvd.com/products/7-inch-Digital-Car-Headrest-DVD-Player-with-USB%7B4...ansmitter.html