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.001","v02/c001"],
  ["Vol.02 Ch.002","v02/c002"],
  ["Vol.02 Ch.003","v02/c003"],
  ["Vol.02 Ch.004","v02/c004"],
  ["Vol.02 Ch.005","v02/c005"],
  ["Vol.03 Ch.001","v03/c001"],
  ["Vol.03 Ch.002","v03/c002"],
  ["Vol.03 Ch.003","v03/c003"],
  ["Vol.03 Ch.004","v03/c004"],
  ["Vol.03 Ch.005","v03/c005"],
  ["Vol.03 Ch.006","v03/c006"],
  ["Vol.04 Ch.001","v04/c001"],
  ["Vol.04 Ch.002","v04/c002"],
  ["Vol.04 Ch.003","v04/c003"],
  ["Vol.04 Ch.004","v04/c004"],
  ["Vol.04 Ch.005","v04/c005"],
  ["Vol.04 Ch.006","v04/c006"],
  ["Vol.05 Ch.001","v05/c001"],
  ["Vol.05 Ch.002","v05/c002"],
  ["Vol.05 Ch.003","v05/c003"],
  ["Vol.05 Ch.004","v05/c004"],
  ["Vol.05 Ch.005","v05/c005"],
  ["Vol.05 Ch.006","v05/c006"],
  ["Vol.06 Ch.001","v06/c001"],
  ["Vol.06 Ch.002","v06/c002"],
  ["Vol.06 Ch.002.2","v06/c002.2"],
  ["Vol.07 Ch.001.1","v07/c001.1"],
  ["Vol.07 Ch.001.2","v07/c001.2"],
  ["Vol.08 Ch.001.1","v08/c001.1"],
  ["Vol.08 Ch.002","v08/c002"],
  ["Vol.08 Ch.003","v08/c003"],
  ["Vol.08 Ch.004.1: The Truth and the True Heart","v08/c004.1"],
  ["Vol.08 Ch.004.2: The Truth and the True Heart","v08/c004.2"],
  ["Vol.08 Ch.004.3: The Truth and the True Heart","v08/c004.3"],
  ["Vol.08 Ch.005.1","v08/c005.1"],
  ["Vol.08 Ch.005.2","v08/c005.2"],
  ["Vol.09 Ch.001","v09/c001"]
);

var total_chapters = 42;

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;