Permanent animation

okay, so this piece of code shows an animation when mousing over my box1 button,
but if I want to show the first frame of the home_box1 clip when the flash starts?

What code can I apply?

box1.onRollOver = function() {

_root.attachMovie("home_box1","btn_01",99);
btn_01._x = 5;
btn_01._y = 31;

Thanks