void handleCameraMove()
{
	Rect screenRect = new Rect(0,0, Screen.width, Screen.height);
	if (!screenRect.Contains (Input.mousePosition)) {
		return;
	}

	panningRect = new Rect (scrollSize, scrollSize, Screen.width - (scrollSize * 2f), Screen.height - (scrollSize * 2f));

	Vector3 direction = Vector3.zero;

	if (mouseX > panningRect.xMax || Input.GetKey(KeyCode.RightArrow)) {
		direction = direction + Vector3.right;
	}

	if (mouseX < panningRect.xMin || Input.GetKey(KeyCode.LeftArrow)) {
		direction = direction + Vector3.left;
	}

	if (mouseY < panningRect.yMin || Input.GetKey(KeyCode.DownArrow)) {
		direction = direction + Vector3.back;
	}

	if (mouseY > panningRect.yMax || Input.GetKey(KeyCode.UpArrow)) {
		direction = direction + Vector3.forward;
	}

	transform.Translate(direction.normalized * panSpeed * Time.deltaTime, Space.World);
}