Need Help With Unity iOS "touch" Code

I found this on the net (cant remember the autor) you need to tweak the public values in the inspector but it is working fine.

//content of DragObject.js

 var normalCollisionCount = 1;

var moveLimit = .5;

var collisionMoveFactor = .01;

var addHeightWhenClicked = 0.0;

var freezeRotationOnDrag = true;

var cam : Camera;

private var myRigidbody : Rigidbody;

private var myTransform : Transform;

private var canMove = false;

private var yPos : float;

private var gravitySetting : boolean;

private var freezeRotationSetting : boolean;

private var sqrMoveLimit : float;

private var collisionCount = 0;

private var camTransform : Transform;

function Start () {

 myRigidbody = rigidbody;
 
 myTransform = transform;
 
 if (!cam) {
     cam = Camera.main;
 }
 if (!cam) {
     Debug.LogError("Can't find camera tagged MainCamera");
     return;
 }
 camTransform = cam.transform;
 sqrMoveLimit = moveLimit * moveLimit;   // Since we're using sqrMagnitude, which is faster than magnitude

}

function OnMouseDown () { canMove = true; myTransform.Translate(Vector3.up*addHeightWhenClicked); gravitySetting = myRigidbody.useGravity; freezeRotationSetting = myRigidbody.freezeRotation; myRigidbody.useGravity = false; myRigidbody.freezeRotation = freezeRotationOnDrag; // yPos = myTransform.position.y; }

function OnMouseUp () {

 canMove = false;
 
 myRigidbody.useGravity = gravitySetting;
 
 myRigidbody.freezeRotation = freezeRotationSetting;
 
 if (!myRigidbody.useGravity) {
 
     myTransform.position.y =  myTransform.position.y-addHeightWhenClicked;  //yPos-addHeightWhenClicked;
 
 }

}

function OnCollisionEnter () {

 collisionCount++;
 

}

function OnCollisionExit () {

 collisionCount--;
 

}

function FixedUpdate () {

 if (!canMove) return;
   
 myRigidbody.velocity = Vector3.zero;


 myRigidbody.angularVelocity = Vector3.zero;

// myTransform.position.y = yPos;

 var mousePos = Input.mousePosition;
 
 var move = cam.ScreenToWorldPoint(Vector3(mousePos.x, mousePos.y,  camTransform.position.y - myTransform.position.y))- myTransform.position;
 

// move.y = 0.0;

 if (collisionCount > normalCollisionCount) {
 
     move = move.normalized*collisionMoveFactor;
 
 }
 
 else if (move.sqrMagnitude > sqrMoveLimit) {
 
     move = move.normalized*moveLimit;
 
 }
   
 myRigidbody.MovePosition(myRigidbody.position + new Vector3(move.x,move.y,0));
 

}

@script RequireComponent(Rigidbody)