More collision detection on walls

1

I noticed someone else has a thread about collision detection and walls, but I think mine is a little bit different, and adding on to his thread with my crap would just make it longer, lol.

This is the very first Flash movie I have ever done, and the first Actionscript undertaking I’ve ever done too, though I’ve had some programming experience. It’s just a simple Pong game, and so far I’ve got the paddle moving (though it kinda goes off the screen, going to learn constraints eventually), and the ball moving, but I am stuck making the ball react to the walls

I know how to detect collisions, and I change a small textfield to say “*Wall smaxor” when the ball hits the different walls, but I can’t get it to reverse directions when it smacks the wall. I will post an .fla if someone wants, but here is the only code that really is important; the code on the _root.ball object, with comments…

onClipEvent(enterFrame) {
 // Walls
 leftWall = topWall = 2.5;
 rightWall = 397.5;
 bottomWall = 217.5;
 
  // Speed vars
  speedx = 3;
  speedy = 3;
 
 // Set direction
 if(hitRight) {
  this._x = rightWall;
  speedx *= -1;
 } else if(hitTop) {
  this._y = topWall;
  speedy *= -1;
 } else if(hitBottom) {
  this._y = bottomWall;
  speedy *= -1;
 } else if(hitLeft) {
  speedx *= -1;
 }
  
  // Display currents
	   //trace(speedx);
   //trace(speedy);
  
  //this._x += speedx;
  this._y += speedy;
 
 // Collision checking
 if(this._x > rightWall) {
  _root.text = "rightWall smax0r.";
  hitRight = 1;
 }
 if(this._x < leftWall) {
  _root.text = "leftWall smax0r.";
  hitLeft = 1;
 }
 if(this._y < topWall) {
  _root.text = "topWall smax0r.";
  hitTop = 1;
 }
 if(this._y > bottomWall) {
  _root.text = "bottomWall smax0r.";
  hitBottom = 1;
 }
}
on(press) {
 startDrag(this.MovieClip);
}
on(release) {
 stopDrag();
}