Activating a sound on Rollover

programming flash
1

I have an invisible button in a swf called “birds.swf” When you rollover the invisible button, a sound is activated. It works fine when I test it in the “birds.swf”. But when the “birds.swf” is loaded into the “stage.swf” on level 10, no sound is heard. I’m sure there’s a simple solution, I’m just spacing out right now.

Here’s the code I put on the main timeline. The invisible button is named “birds”.
[AS]
mySound =new Sound(pic)
birds.onRollOver =function(){
mySound.attachSound(“joinsound”);
mySound.start();
}
[/AS]

Anyone?

Thanks in advance.