var chapter_list = new Array(
  ["Vol.01 Ch.001: Parfait Tic","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.01 Ch.005.5","v01/c005.5"],
  ["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.02 Ch.010","v02/c010"],
  ["Vol.02 Ch.010.5: Are You Happy","v02/c010.5"],
  ["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.03 Ch.015","v03/c015"],
  ["Vol.03 Ch.016","v03/c016"],
  ["Vol.03 Ch.017","v03/c017"],
  ["Vol.04 Ch.018","v04/c018"],
  ["Vol.04 Ch.019","v04/c019"],
  ["Vol.04 Ch.020","v04/c020"],
  ["Vol.04 Ch.021","v04/c021"],
  ["Vol.04 Ch.022","v04/c022"],
  ["Vol.04 Ch.023","v04/c023"],
  ["Vol.04 Ch.024","v04/c024"],
  ["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.05 Ch.007","v05/c007"],
  ["Vol.05 Ch.008","v05/c008"],
  ["Vol.06 Ch.001","v06/c001"],
  ["Vol.06 Ch.002","v06/c002"],
  ["Vol.06 Ch.003","v06/c003"],
  ["Vol.06 Ch.004","v06/c004"],
  ["Vol.06 Ch.005","v06/c005"],
  ["Vol.06 Ch.006","v06/c006"],
  ["Vol.06 Ch.007","v06/c007"],
  ["Vol.07 Ch.001","v07/c001"],
  ["Vol.07 Ch.002","v07/c002"],
  ["Vol.07 Ch.003","v07/c003"],
  ["Vol.07 Ch.004","v07/c004"],
  ["Vol.07 Ch.005","v07/c005"],
  ["Vol.07 Ch.006","v07/c006"],
  ["Vol.07 Ch.007","v07/c007"],
  ["Vol.08 Ch.001","v08/c001"],
  ["Vol.08 Ch.002","v08/c002"],
  ["Vol.08 Ch.003","v08/c003"],
  ["Vol.08 Ch.004","v08/c004"],
  ["Vol.08 Ch.005","v08/c005"],
  ["Vol.08 Ch.006","v08/c006"],
  ["Vol.08 Ch.007","v08/c007"],
  ["Vol.09 Ch.001","v09/c001"],
  ["Vol.09 Ch.002","v09/c002"],
  ["Vol.09 Ch.003","v09/c003"],
  ["Vol.09 Ch.004","v09/c004"],
  ["Vol.09 Ch.005","v09/c005"],
  ["Vol.09 Ch.006","v09/c006"],
  ["Vol.09 Ch.007","v09/c007"],
  ["Vol.10 Ch.001","v10/c001"],
  ["Vol.10 Ch.002","v10/c002"],
  ["Vol.10 Ch.003","v10/c003"],
  ["Vol.10 Ch.004","v10/c004"],
  ["Vol.10 Ch.005","v10/c005"],
  ["Vol.10 Ch.006","v10/c006"],
  ["Vol.10 Ch.007","v10/c007"],
  ["Vol.11 Ch.001","v11/c001"],
  ["Vol.11 Ch.002","v11/c002"],
  ["Vol.11 Ch.003","v11/c003"],
  ["Vol.11 Ch.004","v11/c004"],
  ["Vol.11 Ch.005","v11/c005"],
  ["Vol.11 Ch.006","v11/c006"],
  ["Vol.11 Ch.007","v11/c007"],
  ["Vol.12 Ch.000","v12/c000"],
  ["Vol.13 Ch.000","v13/c000"],
  ["Vol.14 Ch.001","v14/c001"],
  ["Vol.14 Ch.002","v14/c002"],
  ["Vol.14 Ch.003","v14/c003"],
  ["Vol.14 Ch.004","v14/c004"],
  ["Vol.14 Ch.005","v14/c005"],
  ["Vol.14 Ch.006","v14/c006"],
  ["Vol.14 Ch.007","v14/c007"],
  ["Vol.15 Ch.001","v15/c001"],
  ["Vol.15 Ch.002","v15/c002"],
  ["Vol.15 Ch.003","v15/c003"],
  ["Vol.15 Ch.004","v15/c004"],
  ["Vol.15 Ch.005","v15/c005"],
  ["Vol.15 Ch.006","v15/c006"],
  ["Vol.15 Ch.006.5","v15/c006.5"],
  ["Vol.16 Ch.001","v16/c001"],
  ["Vol.16 Ch.002","v16/c002"],
  ["Vol.16 Ch.003","v16/c003"],
  ["Vol.16 Ch.004","v16/c004"],
  ["Vol.16 Ch.005","v16/c005"],
  ["Vol.16 Ch.006","v16/c006"],
  ["Vol.16 Ch.007","v16/c007"],
  ["Vol.17 Ch.001","v17/c001"],
  ["Vol.17 Ch.002","v17/c002"],
  ["Vol.17 Ch.003","v17/c003"],
  ["Vol.17 Ch.004","v17/c004"],
  ["Vol.17 Ch.005","v17/c005"],
  ["Vol.17 Ch.006","v17/c006"],
  ["Vol.17 Ch.007","v17/c007"],
  ["Vol.18 Ch.001","v18/c001"],
  ["Vol.18 Ch.002","v18/c002"],
  ["Vol.18 Ch.003","v18/c003"]
);

var total_chapters = 109;

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;