var rotateSpeed:int = 25;
static var pivotPoint:Vector3; 
static var pivotPointOffset:Vector3; 

function Update()
{

pivotPoint = gameObject.transform.position;
if (gameObject.transform.localScale.x != 1.0) {
	pivotPointOffset.x = gameObject.transform.localScale.x / 2;
}
if (gameObject.transform.localScale.y != 1.0) {
	pivotPointOffset.y = gameObject.transform.localScale.y / 2;
}
if (gameObject.transform.localScale.z != 1.0) {
	pivotPointOffset.z = gameObject.transform.localScale.z / 2;
}
pivotPoint -= pivotPointOffset;

	if(Input.GetKey (KeyCode.LeftArrow))
	{
		gameObject.transform.RotateAround(pivotPoint, Vector3.up, Time.deltaTime * rotateSpeed);
	}
	if(Input.GetKey (KeyCode.RightArrow))
	{
		gameObject.transform.RotateAround(pivotPoint, - Vector3.up, Time.deltaTime * rotateSpeed);
	}
}