Very low quality question, you haven't tried anything, didn't shared your code, please consider taking a read on how to ask questions in a nicer way
– Mr. AlienApr 21 '14 at 07:08
Check this out http://stackoverflow.com/questions/1216114/how-can-i-make-a-div-stick-to-the-top-of-the-screen-once-its-been-scrolled-to
– Samer AburabieApr 21 '14 at 07:09