targetframerate is being ignored

hi,
i set the targetframerate in a javascript file attached to the MainCamera, but when i build and run the game ignores the command and runs at max speed.
Heres the code:

 var speed:float;
 function Awake () {
     // Make the game run as fast as possible in the web player
     Application.runInBackground = true;
     Application.targetFrameRate = 3;
 }
 function Start () {
 
 }
 
 function Update () {
     if(Input.GetKey("w"))
     {
         transform.position.y += speed * Time.deltaTime;
     }
     if(Input.GetKey("s"))
     {
         transform.position.y -= speed * Time.deltaTime;
     }
 }

is there any way to fix this?
thanks in advance!