Unity Javascript Weeping Angel

#pragma strict

/*
COPYRIGHT 2012 HARRISON TURTON, RELEASED UNDER CREATIVE COMMONS, USEAGE ALLOWED IF YOU CREDIT HARRISON TURTON
*/

//target to follow
var target : Transform;

//Checks his position, used to follow the target
var pos : Transform;

//Ray variables (Length... etc.)
var rayLength : float = 3;

//Movement, speed etc.
var speed : float = 2;

//You can move if he is not being looked at
var move : boolean = false;

//I had problems with my model sinking into the floor, adjust this variable if you need it, or remove it
function FixedUpdate()
{
transform.position.y = 2;
}

function Update()
{
    //Setting up Raycast variables for simple object avoidance
    var fwd = transform.TransformDirection (Vector3.forward);
    var hit : RaycastHit;

    //If you are looking at the object...
    if (renderer.isVisible)
    {
    move = false;
    }

    //If you are NOT looking at the object...
    if(!renderer.isVisible)
    {
    move = true;
    }

    //If you are not looking at the object...
    if(move)
    {
    //Make him look at the target
    transform.LookAt(target);
    //Always follow the target
    pos.position += pos.forward * speed * Time.deltaTime;
    }

    //If he is 3 units away from something, move right (Works if you are not looking at the object)
    if (Physics.Raycast (transform.position, fwd, rayLength) && move)
    {
    Debug.Log("Something ahead, moving");
    transform.Translate(Vector3.right * 3 * Time.deltaTime);
    }

}