rotation won't work someone please help?

I have this movement script its simple and the moving forward work well and the walk animation plays when the player moves forward but when I rotate the player nothing happens can someone help me with this problum here is the code:

 #pragma strict
 
 var walkspeed : float = 3.0;
 var rotatespeed : float = 3.0;
 
 
 
 function Start () {
 
 }
 
 function Update () {
     
     if(Input.GetButton("Vertical"))
     {
         transform.Translate(new Vector3(0,0,1) * walkspeed * Time.deltaTime);
         animation.Play("walk");
         
     }
     else
     {
         animation.Play("idle");
     
     }
     
     if(Input.GetButton("Horizontal"))
     {
         transform.Rotate(new Vector3(0,1,0) * rotatespeed * Time.deltaTime);
     
     }
     
 }