var chapter_list = new Array(
  ["Vol.00 Ch.001: Side Story: Night Exile","v00/c001"],
  ["Vol.00 Ch.002: Side Story: Night Exile","v00/c002"],
  ["Vol.01 Ch.001: Dream","v01/c001"],
  ["Vol.01 Ch.002: Despair","v01/c002"],
  ["Vol.01 Ch.003: Daughter","v01/c003"],
  ["Vol.01 Ch.004: Dreizehn","v01/c004"],
  ["Vol.02 Ch.001: Dragon & Dice","v02/c001"],
  ["Vol.02 Ch.002: Delicious & Destruction","v02/c002"],
  ["Vol.03 Ch.001: Diamonde & Desire","v03/c001"],
  ["Vol.03 Ch.002: Dessert & Devil","v03/c002"],
  ["Vol.04 Ch.001","v04/c001"],
  ["Vol.04 Ch.002","v04/c002"],
  ["Vol.05 Ch.001","v05/c001"],
  ["Vol.05 Ch.002","v05/c002"],
  ["Vol.06 Ch.001","v06/c001"],
  ["Vol.06 Ch.002","v06/c002"],
  ["Vol.07 Ch.001","v07/c001"],
  ["Vol.07 Ch.002","v07/c002"],
  ["Vol.08 Ch.001","v08/c001"],
  ["Vol.08 Ch.002","v08/c002"],
  ["Vol.09 Ch.001","v09/c001"],
  ["Vol.09 Ch.002","v09/c002"],
  ["Vol.10 Ch.001","v10/c001"],
  ["Vol.10 Ch.002","v10/c002"]
);

var total_chapters = 24;

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;