Back button

i placed a swf movie in another movie by pressing a button so far so good but i have a button in the pop up swf thats for going back to the main movie i need help in finding out what code i should put in the button thats from the pop up movie , to where when the back button is hit it closes the pop up and goes back to the main movie

if you go to and scroll down to the zzzzzzz it will take you to the movie then hit the welcome button thanks