Stop Sound On Specific Frame and Play ( Resume ) after Exit

hi , i have Flash Project

i made a ON/OFF button for background music sound and use these script :

var my_sound:SoundId = new SoundId();

var my_channel:SoundChannel = new SoundChannel();

my_channel = my_sound.play();

my_channel.addEventListener(Event.SOUND_COMPLETE,introloop);

function introloop(e:Event):void {

    my_channel = my_sound.play(0, 9999);

}

stop_btn.addEventListener(MouseEvent.CLICK, stopSound);

function stopSound(event:MouseEvent):void{

my_channel.stop();

gotoAndStop (2);

}

now i have Frame that i have Flv component ( mp4 Clip ) on it and i have Button on my first frame to go to this Frame , i want to when i Go to Flv frame the  background sound fade out or off and when i exit this frame the background sound again fade in or ON ( better Resume my Sound )

any idea how to do that ??!   specially for play sound again After Exit Flv frame ?!?

thanks ...