var chapter_list = new Array(
  ["Vol.01 Ch.001: That Butler, Talented","v01/c001"],
  ["Vol.01 Ch.002: That Butler, Omnipotent","v01/c002"],
  ["Vol.01 Ch.003: That Butler, Strongest","v01/c003"],
  ["Vol.01 Ch.004: That Butler, The Greatest Evil","v01/c004"],
  ["Vol.02 Ch.005: That Butler, The Busiest","v02/c005"],
  ["Vol.02 Ch.006: That Butler, Activation","v02/c006"],
  ["Vol.02 Ch.007: That Butler, Whimsical","v02/c007"],
  ["Vol.02 Ch.008: That Butler, Commendable","v02/c008"],
  ["Vol.02 Ch.009: That Butler, Encounters","v02/c009"],
  ["Vol.03 Ch.010: That Butler, Looking Back","v03/c010"],
  ["Vol.03 Ch.011: That Butler, Recalling Memories","v03/c011"],
  ["Vol.03 Ch.012: That Butler, Retaliating","v03/c012"],
  ["Vol.03 Ch.013.1: That Butler, Attends a Funeral [Part 1]","v03/c013.1"],
  ["Vol.03 Ch.013.2: That Butler, Attends a Funeral [Part 2]","v03/c013.2"],
  ["Vol.03 Ch.014: That Butler, Hunting","v03/c014"],
  ["Vol.03 Ch.015: The Butler, Freeloader","v03/c015"],
  ["Vol.04 Ch.016: The Butler, Foreigner","v04/c016"],
  ["Vol.04 Ch.017: That Butler, Competing","v04/c017"],
  ["Vol.04 Ch.018: That Butler, Shadow","v04/c018"],
  ["Vol.04 Ch.019: The Butler, Different Talent","v04/c019"],
  ["Vol.04 Ch.020: That Butler, Idea","v04/c020"],
  ["Vol.05 Ch.021.1: That Butler, Competition [Part 1]","v05/c021.1"],
  ["Vol.05 Ch.021.2: That Butler, Competition [Part 2]","v05/c021.2"],
  ["Vol.05 Ch.022: That Butler, Pure Heart","v05/c022"],
  ["Vol.05 Ch.023: That Butler, Intermingling","v05/c023"],
  ["Vol.05 Ch.024: That Butler, On a Stage","v05/c024"],
  ["Vol.05 Ch.025: That Butler, Medical Treatment","v05/c025"],
  ["Vol.05 Ch.026: That Butler, Colleagues","v05/c026"],
  ["Vol.06 Ch.027: That Butler, Show Business","v06/c027"],
  ["Vol.06 Ch.028: That Butler, Negotiation","v06/c028"],
  ["Vol.06 Ch.029: That Butler, Scandalous","v06/c029"],
  ["Vol.06 Ch.030: That Butler, Nurturing","v06/c030"],
  ["Vol.06 Ch.031: That Butler, Observing","v06/c031"],
  ["Vol.06 Ch.032: That Butler, Beautiful People","v06/c032"],
  ["Vol.06 Ch.033: That Butler, Confidence","v06/c033"],
  ["Vol.07 Ch.034: That Butler, Composed","v07/c034"],
  ["Vol.07 Ch.035: That Butler, Accomplished","v07/c035"],
  ["Vol.07 Ch.036: That Butler, Accompanying","v07/c036"],
  ["Vol.07 Ch.037: That Butler, Brand New","v07/c037"],
  ["Vol.07 Ch.038: That Butler, Pitiful","v07/c038"]
);

var total_chapters = 40;

for (var i = 0; i < chapter_list.length; i++) {
  document.getElementById('top_chapter_list').options[i] = new Option(chapter_list[i][0], chapter_list[i][1]);
  document.getElementById('bottom_chapter_list').options[i] = new Option(chapter_list[i][0], chapter_list[i][1]);
}
document.getElementById('top_chapter_list').value=current_chapter;
document.getElementById('bottom_chapter_list').value=current_chapter;
var current_chapter_index = document.getElementById('top_chapter_list').selectedIndex;