I am going on a car trip soon and I would like to take my macbook so I can watch movies in the car. Is there anything I could buy so I could plug my macbook in to my cigarette lighter to charge it? I bought one a few years ago from compusa and it messed up my old windows laptop bad. I had to reinstall the OS and lost all my data. When I took it to the PC store they said that it was a power surge. So I would like something that is safe. I would be willing to spend about 100 bucks. Thanks for the help.