Simple delay/setInterval?

1

I have 2 MC’s on the stage: mc_1 & mc_2.
Both have following action:

onClipEvent (enterFrame) {
    speed = 20;
    this._y += speed;
    if (this._y>=100) {
        this._y = 100;
    }
}

How can I create a simple delay between
the 2 mc’s? setInterval?
Can anyone help me with this?

thanks,

regards