var chapter_list = new Array(
  ["Vol.01 Ch.001: Complete Loss to the Festival Life","v01/c001"],
  ["Vol.01 Ch.002: Who Is the Only M?","v01/c002"],
  ["Vol.01 Ch.003: Secret Friends","v01/c003"],
  ["Vol.01 Ch.004: For Who Is My Power","v01/c004"],
  ["Vol.01 Ch.005: Tomoko's Scoop","v01/c005"],
  ["Vol.01 Ch.006: Dunno","v01/c006"],
  ["Vol.02 Ch.007: Nothing but Lies Everyday","v02/c007"],
  ["Vol.02 Ch.008","v02/c008"],
  ["Vol.02 Ch.009: Unspeakable Determination","v02/c009"],
  ["Vol.02 Ch.010","v02/c010"],
  ["Vol.02 Ch.011.1","v02/c011.1"],
  ["Vol.02 Ch.011.2","v02/c011.2"],
  ["Vol.02 Ch.012.1","v02/c012.1"],
  ["Vol.02 Ch.012.2","v02/c012.2"],
  ["Vol.02 Ch.012.3","v02/c012.3"],
  ["Vol.03 Ch.013: Magokoro Falls Apart","v03/c013"],
  ["Vol.03 Ch.014: 'Cause I'm Your #1 Fan!","v03/c014"],
  ["Vol.03 Ch.015: Determined... for the First Time","v03/c015"],
  ["Vol.03 Ch.016: Magokoro Spirit","v03/c016"],
  ["Vol.03 Ch.017: Confessed True Feelings","v03/c017"],
  ["Vol.04 Ch.018: It's Not Like We Were Trying to Fool You","v04/c018"],
  ["Vol.04 Ch.019: The Separation from Five Years Ago","v04/c019"],
  ["Vol.04 Ch.020: Last Battle","v04/c020"],
  ["Vol.04 Ch.020.5: [Extra: Living Far Away From You]","v04/c020.5"]
);

var total_chapters = 24;

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;