Simple button question

Basicly. I have set up 4 instances of the same button. All i want is so when you click a button it ‘’’‘stays clicked’’’’’ until you click another button. I think I need to set up a function or something that remembers the last button pressed so it only ever effects one button at a time.
Also I cant seem to get each individual button to do something. Basicly i just want each button to jump to a different frame within an mc for now.

Hope someone can help. I’ve been stuck on this for too long and i need to move on! Thanks…