[tem]

you can get what u want changin' this values:

 private function stopScroll():void
        {
            // here I'm checking the left end of the Clip
            //instead of 0 here it starts at 150
            if (xClip > 150) {
            xClip = 150;
            }
            // here the right end
            if (xClip < -(windthClip - widthmovie)) {
            xClip = -(windthClip - widthmovie);
            }
        }

istead of 150 u can put your values..
let me know if it's all right!! :)