var walkSpeed: float = 6;
var crchSpeed: float = 4;   
var runSpeed: float = 30;   
     
private var chMotor: CharacterMotor;
private var tr: Transform;
private var dist: float;   
     
function Start(){
      chMotor = GetComponent(CharacterMotor);
      tr = transform;
      var ch:CharacterController = GetComponent(CharacterController);
      dist = ch.height/2;   
}
     
function Update(){
     
      var vScale = 1.0;
      var speed = walkSpeed;
     
      if (chMotor.grounded && Input.GetKey(KeyCode.RightShift)){
          speed = runSpeed;
      }
      if (Input.GetKey(KeyCode.RightControl)){   
          vScale = 0.5;
          speed = crchSpeed;   
      }
      chMotor.movement.maxForwardSpeed = speed;   
      var ultScale = tr.localScale.y;    
      tr.localScale.y = Mathf.Lerp(tr.localScale.y, vScale, 5*Time.deltaTime);
      tr.position.y += dist * (tr.localScale.y-ultScale);
      }