var chapter_list = new Array(
  ["Vol.01 Ch.001","v01/c001"],
  ["Vol.01 Ch.002: You Mean I'm a Ruler?!","v01/c002"],
  ["Vol.01 Ch.003: Next Stop: Blood Pledge Castle","v01/c003"],
  ["Vol.01 Ch.004: The Three Brothers","v01/c004"],
  ["Vol.01 Ch.005: Pretty Boy vs. Baseball Boy","v01/c005"],
  ["Vol.01 Ch.006","v01/c006"],
  ["Vol.02 Ch.007","v02/c007"],
  ["Vol.02 Ch.008","v02/c008"],
  ["Vol.02 Ch.009","v02/c009"],
  ["Vol.02 Ch.010: Becoming a New Journey","v02/c010"],
  ["Vol.02 Ch.011: This Time it's the Ultimate Weapon?!","v02/c011"],
  ["Vol.02 Ch.012: En Route on the Journey","v02/c012"],
  ["Vol.03 Ch.013: Go to a Dance Party!?","v03/c013"],
  ["Vol.03 Ch.014: A Fight on the Ship's Deck!?","v03/c014"],
  ["Vol.03 Ch.015: The Maou Returns","v03/c015"],
  ["Vol.03 Ch.016: Arrival!! Van Dar Via!","v03/c016"],
  ["Vol.03 Ch.017: The Demonic Sword is Captured?!","v03/c017"],
  ["Vol.03 Ch.018: The Demonic Sword Acquired!!","v03/c018"],
  ["Vol.04 Ch.019: The Fire Festival's Finale?!","v04/c019"],
  ["Vol.04 Ch.020: Demon Sword, Invoked?!","v04/c020"],
  ["Vol.04 Ch.021: For the Team","v04/c021"],
  ["Vol.04 Ch.022: The Conclusion","v04/c022"],
  ["Vol.04 Ch.023: + extras","v04/c023"]
);

var total_chapters = 23;

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;