     if @position == 1
       if prev_section != null
         @$('.sequence-nav-buttons .prev a').removeClass('disabled').click(()=>
-          window.location.href=prev_section
+          #20151026b Add parameter 0 at the end of url
+          window.location.href = prev_section + "0"
         )
       else
         @$('.sequence-nav-buttons .prev a').addClass('disabled')

    if @position == @contents.length
      if next_section != null
        @$('.sequence-nav-buttons .next a').removeClass('disabled').click(()=>
          window.location.href=next_section
        )
      else
        @$('.sequence-nav-buttons .next a').addClass('disabled')

    @num_contents = @contents.length
    @id = @el.data('id')
    @modx_url = @el.data('course_modx_root')
    #20151026b Analysis the url and get the parameter
    @url_split_array = @el[0].baseURI.split('/')
    @prev_button_para = @url_split_array[@url_split_array.length-1]
    @initProgress()
    @bind()
    @render parseInt(@el.data('position'))
