Updated Click To Move

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var smooth:int; // Determines how quickly object moves towards position
private var targetPosition:Vector3;
var speed = 60;

function Update () {

    if(Input.GetKeyDown(KeyCode.Mouse0)) {
        smooth=1;
        var playerPlane = new Plane(Vector3.up, transform.position);
        var ray = Camera.main.ScreenPointToRay (Input.mousePosition);
        var hitdist = 0.0;

            if (playerPlane.Raycast (ray, hitdist)) {

                        var targetPoint = ray.GetPoint(hitdist);
                        targetPosition = ray.GetPoint(hitdist);
                        var targetRotation = Quaternion.LookRotation(targetPoint - transform.position);
                        transform.rotation = targetRotation;
        }
    }

        var dir:Vector3 = targetPosition - transform.position;
    var dist:float = dir.magnitude;
    var move:float = speed * Time.deltaTime;

        if(dist > move){
            transform.position += dir.normalized * move;

        }
    else {
        transform.position = targetPosition;
    }

    transform.position += (targetPosition - transform.position).normalized * speed * Time.deltaTime;

}