primeira = true;
function onPause() {	
	MediaPlayer.Pause();
}
function onStop() {
	MediaPlayer.Stop();
}
		
function onPlay() {
	MediaPlayer.Play();
}

function onVolumeUp() {
	if (MediaPlayer.Volume <= -1000) 
		MediaPlayer.Volume = MediaPlayer.Volume + 1000;
	else 
		MediaPlayer.Volume = 0;
	

}

function onVolumeDown() {

	if (MediaPlayer.Volume >= -9000)
		MediaPlayer.Volume = MediaPlayer.Volume - 1000;
	else 
		MediaPlayer.Volume = -10000;
}