Help in gotoAndPlay sound

programming flash
1

Hello my friend

now i have
3 button
one to play (bt1) so.gotoAndPlay(“m1”); sound
and other (bt2) so.gotoAndPlay(“m2”); sound
and button to play all m2 then m1 sound

theis button like that

and the sound in diffrent layer like that

and this the code

bt1.addEventListener(MouseEvent.CLICK ,pt1);
bt2.addEventListener(MouseEvent.CLICK ,pt2);
playy.addEventListener(MouseEvent.CLICK ,all);

function pt1(event:MouseEvent):void
{
so.gotoAndPlay(“m1”);
}

function pt2(event:MouseEvent):void
{

so.gotoAndPlay(“m2”);
}

function all(event:MouseEvent):void
{

so.gotoAndPlay(“m2”);
so.gotoAndPlay(“m1”);

}

problem is when i click all button to run sound m2,m1 the sound play togather
i want to play m2 then stop then play m1
note the layer label m2 come after m1
so i want to play and stop m2 first then play and stop m1 second

please help me
thank you