NSPlay.Rate = argSpeed; 동영상 속도조절

function onClickFastPlay( argSpeed ) {

    if( Math.abs( argSpeed ) != Math.abs( NSPlay.Rate ) ) {
        prevMPPosition = NSPlay.CurrentPosition;
        NSPlay.Stop();
        NSPlay.CurrentPosition = prevMPPosition;
        NSPlay.Rate = argSpeed;
        NSPlay.Play();
    }
}