Really simple button problem has me stumped

I have a mc that has a series of named frames which each have a nested mc. It also has a frame named “start”, which is where I want the user to return to afte each mc plays, by using a back button named “return_btn” that’s in each nested mc.

This is so simple I’m starting to feel stoopid! Here’s the code I have on the main mc’s timeline:

_root.telFaxScvsFullpg_mc.return_btn.onPress = function(){
_root.gotoAndPlay(“start”);
}

I’ve also tried code in each nested mc,as well as code on the return buttons. But I can’t get the button to send the user back to the named frame.

thanks for any help!