Terrain moving through my guy

Ok, now i have a bad problem.

I have the code:

onClipEvent (enterFrame) {
with (_root.player) {

     // Controls Player Speed
     mySpeed = 3;

     // Controls how far the Player bounces off the wall after impact
     myBounce = 3;

     // keyboard controls
     if (Key.isDown(Key.DOWN)) {
         _y -= mySpeed;
     }
     if (Key.isDown(Key.UP)) {
         _y += mySpeed;
     }
     if (Key.isDown(Key.LEFT)) {
         _x += mySpeed;
     }
     if (Key.isDown(Key.RIGHT)) {
         _x -= mySpeed;
     }

     // detect if edges of the player is colliding with the Maze Walls
     if (walls.hitTest(getBounds(_root).xMax, _y, true)) {
         _x -= myBounce;
     }
     if (walls.hitTest(getBounds(_root).xMin, _y, true)) {
         _x += myBounce;
     }
     if (walls.hitTest(_x, getBounds(_root).yMax, true)) {
         _y -= myBounce;
     }
     if (walls.hitTest(_x, getBounds(_root).yMin, true)) {
         _y += myBounce;
     }

     // detect if Maze is finished
     if (_root.end.hitTest(_x, getBounds(_root).yMax, true)) {
         _root.gotoAndStop(3);
     }
 }

}

and ive labeled my maze’s instance name as “player”, and my guy as “walls”, but my terrain keeps walking through my guy >.<’’