Enemy AI: Flip Problem

programming
1

how do i make the enemy flip horizontally to the side where his moving …
i cant find anything that could help me…

  onClipEvent (enterFrame) {
 _parent.timer++;
 if (moveleft) {
  _parent._x -= _parent.movespeed;
  if (_parent._x<-14) {
   moveleft = false;
   trace("moving right");
  }
 } else {
  _parent._x += _parent.movespeed;
  _parent._xscale *= -1
  if (_parent._x>300) {
   moveleft = true;
   trace("moving left");
  }
 }
 if (_parent.timer>=_parent.holdtime) {
  randomMovement = random(2);
  if (randomMovement == 0) {
   _parent.gotoAndPlay("standup");
  } else {
   _parent.gotoAndPlay("fire");
  }
 }
}