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$(function() {
      var curLesson = 1;
      $('#next').click(function() {
            if (curLesson < 20) {
                  $('#lesson_' + curLesson).hide();
                  curLesson++;
                  $('#lesson_' + curLesson).show();
            }
      });
      $('div.lesson:not(:first)').hide();
      $('#prev').click(function() {
            if (curLesson > 1) {
                  $('#lesson_' + curLesson).hide();
                  curLesson--;
                  $('#lesson_' + curLesson).show();
            }
      });
});

i have this code ... and it works if i start with the first lesson but if i start with second or third or any other lesson when i click previous nothing happens and when i click next it goes to the second lesson !! why ?? any ideea how to fix this??