how do I sync movement with mouselook

I'm making a mobile game. And when I walk and lookaround everythings is ok but if I turn 180 degrees the movement is not synced so when I go forward, I go backwards! can someone please help me out with this? :)

I've a capsule that the FPSwalker script is attatched to and a camera that is a child of it with the touchlook script!

 var speed = 6.0;
 var jumpSpeed = 8.0;
 var gravity = 20.0;
 
 private var moveDirection = Vector3.zero;
 private var grounded : boolean = false;
 
 function FixedUpdate() {
     var joy = VCAnalogJoystickBase.GetInstance("moveStick");
     if (grounded) {
         // We are grounded, so recalculate movedirection directly from axes
         moveDirection = new Vector3(joy.AxisX, 0, joy.AxisY);
         moveDirection = transform.TransformDirection(moveDirection);
         moveDirection *= speed;
         
         if (Input.GetButton ("Jump")) {
             moveDirection.y = jumpSpeed;
         }
     }
 
     // Apply gravity
     moveDirection.y -= gravity * Time.deltaTime;
     
     // Move the controller
     var controller : CharacterController = GetComponent(CharacterController);
     var flags = controller.Move(moveDirection * Time.deltaTime);
     grounded = (flags & CollisionFlags.CollidedBelow) != 0;
 }
 

and heres the touchlook (this one is from unify wiki in C#)

         if (Input.touches.Length > 0)
         {
             if (Input.touches[0].phase == TouchPhase.Moved)
             {
                 Vector2 delta = Input.touches[0].deltaPosition;
                 float rotationZ = delta.x * sensitivityX * Time.deltaTime;
                 rotationZ = invertX ? rotationZ : rotationZ * -1;
                 float rotationX = delta.y * sensitivityY * Time.deltaTime;
                 rotationX = invertY ? rotationX : rotationX * -1;
  
                 transform.localEulerAngles += new Vector3(rotationX, rotationZ, 0);
             }
         }

thanks :)