Need help with Movie's + Button's PLEASE!

i want it to move around randomly, (movie clip) with this code
i also want to thank you in advance!

onClipEvent (load) {

//data you may want to change
width = 700;
height = 600;
speed = Math.round(Math.random()*3
                               )+1;
//initial positions
x = this._x=Math.random()*width;
y = this._y=Math.random()*height-50;
x_new = Math.random()*width;
y_new = Math.random()*height;

}
onClipEvent (enterFrame) {

//x movement
if (x_new>this._x) {

sign_x = 1;
} else {
sign_x = -1;

}
dx = Math.abs(x_new-this._x);
if ((dx>speed) || (dx<-speed)) {

this._x += sign_x*speed;
} else {
x_new = Math.random()*width;

}
//y movement
if (y_new>this._y) {

sign_y = 1;
} else {
sign_y = -1;

}
dy = Math.abs(y_new-this._y);
if ((dy>speed) || (dy<-speed)) {

this._y += sign_y*speed;
} else {
y_new = Math.random()*height;

}

}

BUT I ALSO WANT IT TO BE A BUTTON! with this code …
i want it to open my home page.

btn_Up.onRelease = function() {
getURL(“javascript:launch('index.htm)”);
}