var chapter_list = new Array(
  ["Vol.01 Ch.001: Slow Awakening","v01/c001"],
  ["Vol.01 Ch.002: White Sound","v01/c002"],
  ["Vol.01 Ch.003: One Quiet Step","v01/c003"],
  ["Vol.01 Ch.004: Cuddly Beasts","v01/c004"],
  ["Vol.02 Ch.005: The First Day","v02/c005"],
  ["Vol.02 Ch.006: Hana","v02/c006"],
  ["Vol.02 Ch.007: Water","v02/c007"],
  ["Vol.02 Ch.008: Stars","v02/c008"],
  ["Vol.03 Ch.009: Life","v03/c009"],
  ["Vol.03 Ch.010: Arashi","v03/c010"],
  ["Vol.03 Ch.011: Castle","v03/c011"],
  ["Vol.03 Ch.012: Our Way Home","v03/c012"],
  ["Vol.03 Ch.013: Spirit of Sound","v03/c013"],
  ["Vol.04 Ch.014: Sea Of Trees","v04/c014"],
  ["Vol.04 Ch.015: Aim and Object","v04/c015"],
  ["Vol.04 Ch.016: Howling","v04/c016"],
  ["Vol.04 Ch.017: Rain At Night","v04/c017"],
  ["Vol.04 Ch.018: The Other Side Of The Rainbow","v04/c018"],
  ["Vol.04 Ch.019: Journey","v04/c019"],
  ["Vol.05 Ch.020: Ants And Potatoes","v05/c020"],
  ["Vol.05 Ch.021: Earthworms And Corn","v05/c021"],
  ["Vol.05 Ch.022: Tobacco And Moon","v05/c022"],
  ["Vol.05 Ch.023: Milk And Grave","v05/c023"],
  ["Vol.05 Ch.024: Milk And Grave 2","v05/c024"],
  ["Vol.05 Ch.025: June And October","v05/c025"],
  ["Vol.05 Ch.026: Awakening","v05/c026"],
  ["Vol.06 Ch.027","v06/c027"],
  ["Vol.06 Ch.028","v06/c028"],
  ["Vol.06 Ch.029","v06/c029"],
  ["Vol.06 Ch.030","v06/c030"],
  ["Vol.06 Ch.031","v06/c031"],
  ["Vol.06 Ch.032","v06/c032"],
  ["Vol.06 Ch.033","v06/c033"],
  ["Vol.06 Ch.034: Rainwater","v06/c034"],
  ["Vol.06 Ch.035","v06/c035"]
);

var total_chapters = 35;

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;