var mc = createEmptyMovieClip("container", this.getNextHighestDepth());

for (var i = 0; i<2; i++) {

mc.attachMovie("mc","mc"+i,i,{_x:Stage.width*i, _y:250});

}

mc.onEnterFrame = function() {

this._x -= 1;

if(this._x < -Stage.width){

 this._x = 0;

 }

};