var chapter_list = new Array(
  ["Vol.01 Ch.000: Ghost Hunt","v01/c000"],
  ["Vol.02 Ch.000: Doll House","v02/c000"],
  ["Vol.03 Ch.000: After School Curse","v03/c000"],
  ["Vol.04 Ch.000: A Forbidden Game","v04/c000"],
  ["Vol.05 Ch.000: A Forbidden Game Part 2","v05/c000"],
  ["Vol.06 Ch.000: The Bloodstained Labyrinth","v06/c000"],
  ["Vol.07 Ch.000: The Bloodstained Labyrinth Part 2","v07/c000"],
  ["Vol.08 Ch.000: The Cursed House","v08/c000"],
  ["Vol.09 Ch.001: The Cursed House Part 2","v09/c001"],
  ["Vol.09 Ch.002: The Cursed House Part 3","v09/c002"],
  ["Vol.10 Ch.001.1: Forgotten Children Part 1","v10/c001.1"],
  ["Vol.10 Ch.001.2: Forgotten Children Part 2","v10/c001.2"],
  ["Vol.10 Ch.001.3: Forgotten Children Part 3","v10/c001.3"],
  ["Vol.10 Ch.001.4: Forgotten Children Part 4","v10/c001.4"],
  ["Vol.10 Ch.001.5: Forgotten Children Part 5","v10/c001.5"],
  ["Vol.11 Ch.001.1: Forgotten Children 2 Part 1","v11/c001.1"],
  ["Vol.11 Ch.001.2: Forgotten Children 2 Part 2","v11/c001.2"],
  ["Vol.11 Ch.001.3: Forgotten Children 2 Part 3","v11/c001.3"],
  ["Vol.11 Ch.001.4: Forgotten Children 2 Part 4","v11/c001.4"]
);

var total_chapters = 19;

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;