I am having two errors with my jump script

 var jumpVelocity : float = 20;
 
 
 @HideInInspector
 var grounded : boolean = false;
 
 function Update ()
 {
 if (Input.GetButtonDown("Jump"))
     rigidbody.AddForce(0,jumpVelocity,0);
 }
 
 function OnCollisionStay (collision : Collision)
 {
     for (var contact : ContactPoint in collision.contacts)
     {
         if (Vector3.Angle(contact.normal, Vector3.up < maxSlope) 
             grounded = true;
     }
 }
 
 errors
 
 Assets/Jump.js(16,13): BCE0044: expecting ), found 'grounded'.
 
 Assets/Jump.js(16,22): BCE0043: Unexpected token: =.
 
 And yes i am a Beginner thanks