When i close my sgh-f210 the music player always comes on, how do i get it off?

When i close my sgh-f210 the music player always comes on, how can i get it off?
Answer
We got our daughter the f210 for her birthday last month and we wondered the same so we phoned samsung. they told us it was the design of the phone.mp3 player when closed and a phone when open, they advised us to use the lock button to prevent the mp3 player coming on accidently.