Play mc1 then play mc2?

dear all…
i have dificult to making this script.
i have 2 mc’s those all have an motion tween.
chase like this :

when im clicked button.
mc1 play motion tween.
and when mc1 stoped.
mc2 playing motion tween.

i know this is simple if else scripts, but i dont know to read it :slight_smile:
and this is my scripts :

on(release) {
if(pressed){ // i dont know this one

thanks in advanced.