How do I make my player face the direction its moving

Hi guys, i'm creating a game for android and i'm using unity mobile assets- sidescrollerSetup. How can I make the player face the direction is moving? I mean when joystick is dragged left, he faces left, when joystick is dragged to right, he faces right? yeah, and here is the code i use:

 #pragma strict
 
 @script RequireComponent( CharacterController )
 
 // This script must be attached to a GameObject that has a CharacterController
 var moveTouchPad : Joystick;
 var jumpTouchPad : Joystick;
 
 var forwardSpeed : float = 4;
 var backwardSpeed : float = 4;
 var jumpSpeed : float = 16;
 var inAirMultiplier : float = 0.25;                    // Limiter for ground speed while jumping
 
 private var thisTransform : Transform;
 private var character : CharacterController;
 private var velocity : Vector3;                        // Used for continuing momentum while in air
 private var canJump = true;
 
 function Start()
 {
     // Cache component lookup at startup instead of doing this every frame        
     thisTransform = GetComponent( Transform );
     character = GetComponent( CharacterController );    
 
     // Move the character to the correct start position in the level, if one exists
     var spawn = GameObject.Find( "PlayerSpawn" );
     if ( spawn )
         thisTransform.position = spawn.transform.position;
 }
 
 function OnEndGame()
 {
     // Disable joystick when the game ends    
     moveTouchPad.Disable();    
     jumpTouchPad.Disable();    
 
     // Don't allow any more control changes when the game ends
     this.enabled = false;
 }
 
 function Update()
 {
     var movement = Vector3.zero;
 
     // Apply movement from move joystick
     if ( moveTouchPad.position.x > 0 )
         movement = Vector3.right * forwardSpeed * moveTouchPad.position.x;
     else
         movement = Vector3.right * backwardSpeed * moveTouchPad.position.x;
     
     // Check for jump
     if ( character.isGrounded )
     {        
         var jump = false;
         var touchPad = jumpTouchPad;
             
         if ( !touchPad.IsFingerDown() )
             canJump = true;
         
          if ( canJump && touchPad.IsFingerDown() )
          {
             jump = true;
             canJump = false;
          }    
         
         if ( jump )
         {
             // Apply the current movement to launch velocity        
             velocity = character.velocity;
             velocity.y = jumpSpeed;    
         }
     }
     else
     {            
         // Apply gravity to our velocity to diminish it over time
         velocity.y += Physics.gravity.y * Time.deltaTime;
                 
         // Adjust additional movement while in-air
         movement.x *= inAirMultiplier;
 //        movement.z *= inAirMultiplier;
     }
         
     movement += velocity;    
     movement += Physics.gravity;
     movement *= Time.deltaTime;
     
     // Actually move the character    
     character.Move( movement );
     
     if ( character.isGrounded ){ {
         moveDirection = Vector3(Input.GetAxis("Horizontal"), 0, 0);
         moveDirection *= speed;
 
         if (moveDirection.sqrMagnitude > 0.01)
             transform.rotation = Quaternion.Slerp (transform.rotation, Quaternion.LookRotation (moveDirection), 90);
     }
 
     moveDirection.y -= gravity * Time.deltaTime;
     controller.Move(moveDirection * Time.deltaTime);           
 }
         // Remove any persistent velocity after landing    
         velocity = Vector3.zero;
 }