     @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'))

    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')

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