Close MC

ok guys … i have this button which plays an MC. this MC has also a button which supposed to close the MC and return to the initial situation. i am kind of confused how to explain it but i have attached the file, it will say it all.

i am planing to use this as my “contact” in my website. anyone can help ? i just thought about it cos i saw it in many sites and i had no idea how to do it, but i managed to do most of it except this “close” thing.

also u can notice that even when the new MC is played, the old button is still functional.

any advice ?