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.006","v02/c006"],
  ["Vol.02 Ch.007","v02/c007"],
  ["Vol.02 Ch.008: Side Story: Dream Come True","v02/c008"],
  ["Vol.03 Ch.009","v03/c009"],
  ["Vol.03 Ch.010","v03/c010"],
  ["Vol.03 Ch.011","v03/c011"],
  ["Vol.03 Ch.011.1: Side Story: Teen's Drop","v03/c011.1"],
  ["Vol.03 Ch.011.2: Extra Stories 1 & 2","v03/c011.2"],
  ["Vol.04 Ch.012","v04/c012"],
  ["Vol.04 Ch.013","v04/c013"],
  ["Vol.04 Ch.014","v04/c014"],
  ["Vol.04 Ch.015","v04/c015"],
  ["Vol.04 Ch.016","v04/c016"],
  ["Vol.04 Ch.017","v04/c017"],
  ["Vol.05 Ch.018","v05/c018"],
  ["Vol.05 Ch.019","v05/c019"],
  ["Vol.05 Ch.020","v05/c020"],
  ["Vol.05 Ch.021","v05/c021"],
  ["Vol.05 Ch.022","v05/c022"],
  ["Vol.05 Ch.023","v05/c023"],
  ["Vol.06 Ch.024","v06/c024"],
  ["Vol.06 Ch.025","v06/c025"],
  ["Vol.06 Ch.026","v06/c026"],
  ["Vol.06 Ch.027","v06/c027"],
  ["Vol.06 Ch.028","v06/c028"],
  ["Vol.06 Ch.029","v06/c029"],
  ["Vol.07 Ch.030","v07/c030"],
  ["Vol.07 Ch.031","v07/c031"],
  ["Vol.07 Ch.032","v07/c032"],
  ["Vol.07 Ch.033: Extra","v07/c033"],
  ["Vol.07 Ch.034: Side Story: After School Dreams","v07/c034"],
  ["Vol.07 Ch.035","v07/c035"],
  ["Vol.08 Ch.036","v08/c036"],
  ["Vol.08 Ch.037","v08/c037"],
  ["Vol.08 Ch.038","v08/c038"],
  ["Vol.08 Ch.039","v08/c039"],
  ["Vol.08 Ch.040","v08/c040"],
  ["Vol.08 Ch.041","v08/c041"],
  ["Vol.09 Ch.042","v09/c042"],
  ["Vol.09 Ch.043","v09/c043"],
  ["Vol.09 Ch.044","v09/c044"],
  ["Vol.09 Ch.045","v09/c045"],
  ["Vol.09 Ch.046","v09/c046"],
  ["Vol.09 Ch.047","v09/c047"],
  ["Vol.10 Ch.048","v10/c048"],
  ["Vol.10 Ch.049","v10/c049"],
  ["Vol.10 Ch.050","v10/c050"],
  ["Vol.10 Ch.051: Last","v10/c051"],
  ["Vol.10 Ch.051.1: Extra 1: Shampoo's Worry","v10/c051.1"],
  ["Vol.10 Ch.051.2: Extra 2: Hysteric Heart","v10/c051.2"],
  ["Vol.10 Ch.051.3: Extra 3: Narumi's Routine","v10/c051.3"]
);

var total_chapters = 56;

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;