var chapter_list = new Array(
  ["Vol.01 Ch.001","v01/c001"],
  ["Vol.01 Ch.002","v01/c002"],
  ["Vol.01 Ch.003","v01/c003"],
  ["Vol.01 Ch.004","v01/c004"],
  ["Vol.01 Ch.005","v01/c005"],
  ["Vol.02 Ch.006","v02/c006"],
  ["Vol.02 Ch.007","v02/c007"],
  ["Vol.02 Ch.008","v02/c008"],
  ["Vol.02 Ch.009","v02/c009"],
  ["Vol.02 Ch.010","v02/c010"],
  ["Vol.02 Ch.011","v02/c011"],
  ["Vol.03 Ch.012","v03/c012"],
  ["Vol.03 Ch.013","v03/c013"],
  ["Vol.03 Ch.014","v03/c014"],
  ["Vol.03 Ch.015","v03/c015"],
  ["Vol.03 Ch.016","v03/c016"],
  ["Vol.04 Ch.017","v04/c017"],
  ["Vol.04 Ch.018","v04/c018"],
  ["Vol.04 Ch.019","v04/c019"],
  ["Vol.04 Ch.020","v04/c020"],
  ["Vol.04 Ch.021","v04/c021"],
  ["Vol.05 Ch.022","v05/c022"],
  ["Vol.05 Ch.023","v05/c023"],
  ["Vol.05 Ch.024","v05/c024"],
  ["Vol.05 Ch.025","v05/c025"],
  ["Vol.05 Ch.026","v05/c026"],
  ["Vol.06 Ch.027","v06/c027"],
  ["Vol.06 Ch.028","v06/c028"],
  ["Vol.06 Ch.029","v06/c029"],
  ["Vol.06 Ch.030","v06/c030"],
  ["Vol.06 Ch.031","v06/c031"],
  ["Vol.07 Ch.032","v07/c032"],
  ["Vol.07 Ch.033","v07/c033"],
  ["Vol.07 Ch.034","v07/c034"],
  ["Vol.07 Ch.035","v07/c035"],
  ["Vol.08 Ch.036","v08/c036"],
  ["Vol.08 Ch.037","v08/c037"],
  ["Vol.08 Ch.038","v08/c038"],
  ["Vol.08 Ch.039","v08/c039"],
  ["Vol.08 Ch.040: End","v08/c040"]
);

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;