var thePrefab : GameObject;

function Start () {

    var floorArray : Array = new Array(10);

    for (var x = 0; x < 10; x++) {

        if (!floorArray[x]) {  // this check is probably pointless
            floorArray[x] = new Array(10);
        }

        for (var z = 0; z < 10; z++) {

            var instance : GameObject = Instantiate(thePrefab, transform.position, transform.rotation);
            var y = 0.5;
            instance.transform.position = Vector3(x, y, z);
            floorArray[x][y] = instance;

        }

    }

}