attach a prefab as child to a gameobject in scene

is it possible with JavaScript to attach a prefab as child to a gameobject in a scene?

my try don't attach my prefab as child:

var EmptyInScene : GameObject;
var MyPrefab : GameObject;

Instantiate(MyPrefab, EmptyInScene.transform.position, EmptyInScene.transform.rotation);

I assume `EmptyInScene` is the object you want to have as parent?

var EmptyInScene : GameObject;
var MyPrefab : GameObject;

var NewObject : GameObject = Instantiate(MyPrefab, EmptyInScene.transform.position, EmptyInScene.transform.rotation);
NewObject.transform.parent = EmptyInScene.transform;