expecting (, found 'OnGui' HELP!!!

 var playerSpeed : int;
 
 var playerLives : int;
 
 static var playerScore : int;
 
 var bullet : Rigidbody;
 
 
 function Update () {
 
 
 amtToMove = (playerSpeed * Input.GetAxis("Horizontal")) * Time.deltaTime;
 
 transform.Translate(Vector3.right * amtToMove);
 
 
 if( Input.GetKeyDown("space")){
 
    var tempBullet : Rigidbody;
    
    tempBullet = Instantiate(bullet,transform.position,transform.rotation);
 
 
 }
 
 
         
 function OnGUI(){
 
 GUI.Label(Rect(10,10,200,50),"Score:" + playerScore);
 
 GUI.Label(Rect(10,30,200,50),"Lives:" + playerLives);
 
 }

please help I am completely lost and have tried doing everything it says please be aware I am very new to scripting and unity and don't know a lot!