Music player

I created a simple music player in flash, I stored all the sounds in seperate mc’s on different frames, I have a button that will begin playing once it is clicked, the problem is if I hit that button again it will play the clip again, how I check to see if sound is playing then stop the sound before I go on to the next clip?

have the movie clip set a variable on the root timeline that says what song is playing, then have each button check that variable.\r:) \rjeremy

that sounds pretty simple, thanks…