I'm using the following code to rotate a camera while looking at an object. I'm having some real problems trying to stop the camera when the camera's x axis =90 degrees. I can't find out how to reference this value that I can see in the inspector...

var target : Transform;

    function Update() {
        transform.RotateAround (Vector3.zero, Vector3(1,0,0), 5 * Time.deltaTime);
        transform.LookAt(target);
    }