public static void NextLesson()
    {
        FlowControl.MenuState = false;
        List <Lesson> lessons = CustomLessons.GetInstance().GetLessons();

        int index = -1;

        for (int i = 0; i < lessons.Count; i++)
        {
            if (lessons[i].GetSceneName().Equals(currentSlides.GetSceneName()))
            {
                index = i;
                break;
            }
        }

        if (index != -1 && index + 1 < lessons.Count)
        {
            //FlowControl.SetLesson(lessons[index+1].GetSceneName());
            //Application.LoadLevel ("Lesson_Loader");
            GoToLessonScreen();
        }
        else
        {
            GoToLessonScreen();
        }
    }