Inifinite scroll - almsot working, but need help

I have a movie clip I need to scroll infinitely from right to left, seamlessly.

In the first frame I have:

Code:

---

moveAmt = 40;
stop();

---

I then have two instances of one movieclip on the stage, "strip" and "strip2". On "strip" the following clip actions are applied:

Code:

---

//initialize
onClipEvent (load) {
        percent_increment = .075;
        addstrip2 = false;
}
onClipEvent (enterFrame) {
        this._x -= (_root.moveAmt)*percent_increment;
        //
        if (this._x<=0 && this._x>=-this._width) {
                _root.strip2._x = this._x+this._width-1;
                _root.strip2._y = this._y;
                trace("step 1");
        }
        if (this._x<=-this._width) {
                this._x = _root.strip2._x+this._width-1;
                trace("step 2");
        }
        if (this._x>0 && this._x<this._width) {
                _root.strip2._x = this._x+this._height-1;
                _root.strip2._y = this._y;
                trace("step 3");
        }
        if (this._x>=this._width) {
                this._x = _root.strip2._x-this._width+1;
                trace("step 4");
        }
}

---

They both scroll from right to left without a hitch, but then stop and don't loop like they should. What am I doing wrong?

Thanks in advance.

No one can help? :(