var chapter_list = new Array(
  ["Vol.01 Ch.001: the 1st day","v01/c001"],
  ["Vol.01 Ch.002","v01/c002"],
  ["Vol.01 Ch.003","v01/c003"],
  ["Vol.01 Ch.004","v01/c004"],
  ["Vol.02 Ch.005","v02/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.03 Ch.010","v03/c010"],
  ["Vol.03 Ch.011","v03/c011"],
  ["Vol.03 Ch.012","v03/c012"],
  ["Vol.03 Ch.013","v03/c013"],
  ["Vol.03 Ch.014","v03/c014"],
  ["Vol.04 Ch.015","v04/c015"],
  ["Vol.04 Ch.016","v04/c016"],
  ["Vol.04 Ch.017","v04/c017"],
  ["Vol.04 Ch.018: Step","v04/c018"],
  ["Vol.04 Ch.019: Extra Works: Clash of Heroes","v04/c019"],
  ["Vol.05 Ch.020: Omen","v05/c020"],
  ["Vol.05 Ch.021: Midnight Visitor","v05/c021"],
  ["Vol.05 Ch.022: Verdict","v05/c022"],
  ["Vol.05 Ch.023: Bloodfort Andromeda","v05/c023"],
  ["Vol.05 Ch.024: Extra Works II: Remembrance","v05/c024"],
  ["Vol.06 Ch.025: Sealing Darkness","v06/c025"],
  ["Vol.06 Ch.026.1: Skyscraper (I)","v06/c026.1"],
  ["Vol.06 Ch.027: Skyscraper (II)","v06/c027"],
  ["Vol.06 Ch.028: Noble Phantasm","v06/c028"]
);

var total_chapters = 28;

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;