http://gringofxs.webs.com/one.jpg
http://gringofxs.webs.com/two.jpg

I have a GUItexture button. and a 3d object that appear and desapear over the image TRACK, with the touch of the GUItexture button in the screen. The problem is that when im not over the image TRACK, if i touch the GUItexturebutton, the object appear in the scene and it supouse to do not appear, to work only with the image TRACK. 

here is the code. How can i fix that code in order to work just with the imageTRACK.

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var myObject : GameObject;

function Start(){
myObject = GameObject.Find("teapot");
}

function Update () {
if (Input.touchCount > 0 && Input.GetTouch(0).phase == TouchPhase.Began){
if (guiTexture.HitTest(Input.GetTouch(0).position)){
myObject.renderer.enabled = !myObject.renderer.enabled;
}
}
}