var chapter_list = new Array(
  ["Vol.01 Ch.001: The Fetching Fairy Who Fell On Earth","v01/c001"],
  ["Vol.01 Ch.001.1","v01/c001.1"],
  ["Vol.02 Ch.001","v02/c001"],
  ["Vol.02 Ch.001.1","v02/c001.1"],
  ["Vol.03 Ch.001","v03/c001"],
  ["Vol.03 Ch.001.1","v03/c001.1"],
  ["Vol.04 Ch.001","v04/c001"],
  ["Vol.04 Ch.001.1","v04/c001.1"],
  ["Vol.05 Ch.001","v05/c001"],
  ["Vol.05 Ch.001.1","v05/c001.1"],
  ["Vol.06 Ch.001","v06/c001"],
  ["Vol.07 Ch.001","v07/c001"],
  ["Vol.08 Ch.001","v08/c001"],
  ["Vol.08 Ch.001.1","v08/c001.1"],
  ["Vol.09 Ch.001","v09/c001"],
  ["Vol.10 Ch.001","v10/c001"],
  ["Vol.11 Ch.001","v11/c001"],
  ["Vol.12 Ch.001","v12/c001"],
  ["Vol.13 Ch.001","v13/c001"],
  ["Vol.14 Ch.001","v14/c001"],
  ["Vol.15 Ch.001","v15/c001"],
  ["Vol.16 Ch.001","v16/c001"],
  ["Vol.16 Ch.001.1","v16/c001.1"],
  ["Vol.17 Ch.000","v17/c000"],
  ["Vol.18 Ch.001","v18/c001"],
  ["Vol.18 Ch.002","v18/c002"],
  ["Vol.18 Ch.003","v18/c003"],
  ["Vol.18 Ch.004","v18/c004"],
  ["Vol.18 Ch.005","v18/c005"],
  ["Vol.18 Ch.005.1: Side Story 1","v18/c005.1"],
  ["Vol.18 Ch.005.2","v18/c005.2"],
  ["Vol.18 Ch.005.3","v18/c005.3"],
  ["Vol.19 Ch.001","v19/c001"],
  ["Vol.19 Ch.002","v19/c002"],
  ["Vol.19 Ch.003","v19/c003"],
  ["Vol.19 Ch.004","v19/c004"],
  ["Vol.19 Ch.005","v19/c005"],
  ["Vol.19 Ch.006","v19/c006"],
  ["Vol.19 Ch.007","v19/c007"]
);

var total_chapters = 39;

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;