[iOS/Android] U3D repeats tap to new scene

First, how i detect taps:

 if (iPhoneInput.touchCount > 0) {
         var touch = iPhoneInput.GetTouch(0);
         var pos = touch.position;
         var ray : Ray = Camera.main.ScreenPointToRay(Vector3(touch.position.x, touch.position.y));
         var hit : RaycastHit;
         if (Physics.Raycast(ray,hit))
         {
             if (hit.collider.name == "new game")
             {
 .......

Pretty standard. My problem is when user is tapping "Menu" on some level, eg. 9 (Application.LoadLevel(0) is executed) unity is "doubling" this tap in new scene (MainMenu). In the same place where "Menu" button on each level is in MainMenu i have "Continue" button, and in result when I click "Menu" MainMenu flashes, and the same level is opening again. For some odd reason when i manage to click enough fast MainMenu opens, but the whole game just freezes. I've tried adding yield WaitForSeconds(1.0) to Start() in mainmenu script but without effect - MainMenu displays for 1s, and then disappears.

Sorry for my English, I'm from Poland. Hope you've understood my problem, and will help me finding solution.