Timer in AS2

I am attempting to make a game in AS2, that I know as simon says.

There are 4 different colored lights (i have create 4 movie clips), what i want to do is have one light show up for 1 second then fade, 1 second later another light to light up then fade (this process will repeat a couple of times).

Then the user enters the color combination.

Can anyone help, all assistance greatly appreciated.

Rod