unity - How to keep a GameObject from dropping?

I am applying the following script to first person object:

function Update () {
   var mountain : GameObject;


   mountain = GameObject.Find("QuantumCold_B");
   transform.RotateAround(mountain.transform.position, Vector3.up,20 * Time.deltaTime);
}

When I run this it looks like the mountain is turning and the first person object is falling. I applied this script to the first person object thinking it would rotate around the mountain. Perhaps I need to apply lookAt in some way? How do I keep the first person object form falling?

I did set the gravity=0 for motor section of Character Motor Script.