checking which gameobject has being touched

Hi all i am having trouble with a script. This is the issue: I have a raycast script that sends a raycast from the camera into the scene and checks what object (with a collider) has being touched. After this the script turns around another gameojbect (defined by a transform in the script).

The problem is that i want the raycast script only to do something when one specific object has been touched. But now it responds to all the object in the scene with a collider. And i can’t remove the collider because it’s used for other functions in the game.

I tried to do this by putting a second transfrom into the script so i can select in the menu which gameobject should be checked for touch but i can’t get the syntax right.

This is my script:

private var hit : RaycastHit;
private var ray : Ray;//wanneer raken we het object??
var speed : float = 100;
var turntarget: Transform;
var touchtarget: Transform;

function FixedUpdate () {

    if(Input.touchCount == 1) {
        ray = Camera.main.ScreenPointToRay(Input.touches[0].position);
        Debug.DrawLine(ray.origin,ray.direction * 10);
        if(Physics.Raycast(ray.origin, ray.direction * 10,hit)){
             if (Input.touchCount > 0 && Input.GetTouch(0).phase == TouchPhase.Moved) {
// bereken beweging sinds het laatste frame
 var touchDeltaPosition:Vector2 = Input.GetTouch(0).deltaPosition;
 turntarget.transform.Rotate(Vector3.up * touchDeltaPosition.x * Time.deltaTime * speed);

You could compare the hit transform to touchTarget:

if(Physics.Raycast(ray.origin, ray.direction * 10,hit) && hit.transform == touchTarget){
    // touchTarget was hit