rotation in a clockwise manner

i need to make my character rotate when it wants to move backward...this is my script below...

var speed : float = 6.0; var speed2 : float=10; var jumpSpeed : float = 8.0; var jumpSpeed2 : float = 18.0; var gravity : float = 20.0; private var moveDirection : Vector3 = Vector3.zero; var pop : AudioClip;

 function Update() {
 if(Input.GetKeyDown(KeyCode.RightArrow)){
 animation.Play("TIMI ANIMATION");
 
 }
     var controller : CharacterController = GetComponent(CharacterController);
     if (controller.isGrounded) {
         
         moveDirection = Vector3(0, 0, Input.GetAxis("Horizontal"));
         moveDirection = transform.TransformDirection(moveDirection);
         moveDirection *= speed;
        
        if(Input.GetKey(KeyCode.UpArrow)){
             moveDirection.y = jumpSpeed;
             audio.PlayOneShot(pop);
         }
         
     }
     
 }
 function HighJump(){
  var controller : CharacterController = GetComponent(CharacterController);
    
             moveDirection.y = jumpSpeed2;
         
     
     
  }