Hey guys, since today I use a second screen with my Macbook. But if I watch a stream or a video it look like this: http://s7.directupload.net/file/d/3432/45dsrtk4_jpg.htm On the top and bottom are these bars, and I dont want them! I use my second screen as a second screen, so I can work on my Macbook while I watch a movie. How to delete these bars???