var chapter_list = new Array(
  ["Vol.01 Ch.001: Mission 1: The Legend Begins","v01/c001"],
  ["Vol.01 Ch.002: Mission 2","v01/c002"],
  ["Vol.01 Ch.003: Mission 3: Today and Tomorrow for a Chance Meeting","v01/c003"],
  ["Vol.01 Ch.004: Mission 4: Everyday Is For-","v01/c004"],
  ["Vol.01 Ch.005: Mission 5: The One Who Burns, The One Who Loves","v01/c005"],
  ["Vol.01 Ch.006: Mission 6: Disease Of Ignorance","v01/c006"],
  ["Vol.01 Ch.007: Mission 7: The Night Of Necessary Evil","v01/c007"],
  ["Vol.02 Ch.008: Mission 1: The Connection Of Fate","v02/c008"],
  ["Vol.02 Ch.009: Mission 2: The Wind of the Beginning","v02/c009"],
  ["Vol.02 Ch.010: Mission 3: The Relative Theory of Idiot Speed","v02/c010"],
  ["Vol.02 Ch.011: Mission 4: The Equation of Freedom","v02/c011"],
  ["Vol.02 Ch.012: Mission 5: The Victim and the Assailant","v02/c012"],
  ["Vol.02 Ch.013: Mission 6: The Wind's Direction","v02/c013"],
  ["Vol.02 Ch.014: Mission 7: The Unfortunate Happiness","v02/c014"],
  ["Vol.02 Ch.015: Mission 8: The Joy of the Defeated","v02/c015"],
  ["Vol.03 Ch.016: Mission 1: Destroy, Then Choose","v03/c016"],
  ["Vol.03 Ch.017: Mission 2: The Free Electric Waves","v03/c017"],
  ["Vol.03 Ch.018: Mission 3: The White Shape","v03/c018"],
  ["Vol.03 Ch.019: Mission 4: Bubble Kaleidoscope","v03/c019"],
  ["Vol.03 Ch.020: Mission 5: The Lost Items Went Into the Clear White Sky","v03/c020"],
  ["Vol.03 Ch.021: Mission 6: He's Not Going to Open the Treasure Box","v03/c021"],
  ["Vol.03 Ch.022: Mission 7: Come... And Gone...","v03/c022"],
  ["Vol.04 Ch.023: Mission 1: The Unseen Choice","v04/c023"],
  ["Vol.04 Ch.024: Mission 2: The Uses of Oxygen","v04/c024"],
  ["Vol.04 Ch.025: Mission 3: The Hiding Decay","v04/c025"],
  ["Vol.04 Ch.026: Mission 4: The Professor's 23 Hours, 56 Minutes, and 4 Seconds","v04/c026"],
  ["Vol.04 Ch.027: Mission 5: The Season Far Away From the Sun","v04/c027"],
  ["Vol.04 Ch.028: Mission 6: Into the Maze","v04/c028"],
  ["Vol.04 Ch.029: Mission 7: The Path that is Walked Alone","v04/c029"],
  ["Vol.04 Ch.030: Mission 8: The Ocean and Sky are Murder Weapons","v04/c030"],
  ["Vol.08 Ch.001: Excel Saga Vol.08 Mission 1: Hold Your Breath and Wait for Me","v08/c001"],
  ["Vol.08 Ch.002: Mission 2: Two Shadows","v08/c002"],
  ["Vol.08 Ch.003: The Reality Called Illusion","v08/c003"]
);

var total_chapters = 33;

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;