var chapter_list = new Array(
  ["Vol.01 Ch.000: 1.EarthGlow \ 2.Sea of Fertility \ 3.Maelstrom III \ 4.Posterity","v01/c000"],
  ["Vol.02 Ch.000: 5.Rendezvous \ 6.Discovery \ 7.Lucifer Rising Part 1","v02/c000"],
  ["Vol.03 Ch.000: 7.Lucifer Rising Part 2","v03/c000"],
  ["Vol.04 Ch.000: 8.The Lights of Heaven \ 9.Journey Beyond Tomorrow \ Part I: I Am Rocket \ Part II: A Gift from Earth","v04/c000"],
  ["Vol.05 Ch.000: 10.Medusa's Throne \ Expedition A: City of Stone \ Expedition B: Ocean of Sand \ Expedition C: Medusa's Gaze \ 11.A Stranger's Footsteps","v05/c000"],
  ["Vol.06 Ch.000: 12.Symbiotic Planet \ 13.Final Evolution","v06/c000"],
  ["Vol.07 Ch.000: 14.Elliptical Orbit \ 15.An Hour's Song in a Birdless Sky","v07/c000"],
  ["Vol.08 Ch.000: 16.Colony \ 17.So Brief, So Lasting a Love","v08/c000"],
  ["Vol.09 Ch.000: 18.Odyssy in Green","v09/c000"],
  ["Vol.10 Ch.000: 18.Odyssy in Green Part 2 \ The Final Night: Children of Earth","v10/c000"]
);

var total_chapters = 10;

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;