var chapter_list = new Array(
  ["Vol.01 Ch.000: Resurection...","v01/c000"],
  ["Vol.02 Ch.000","v02/c000"],
  ["Vol.03 Ch.000","v03/c000"],
  ["Vol.04 Ch.000","v04/c000"],
  ["Vol.05 Ch.000","v05/c000"],
  ["Vol.06 Ch.001: Blade Edge","v06/c001"],
  ["Vol.06 Ch.002: The Voice of Blade","v06/c002"],
  ["Vol.06 Ch.003: All I Want is Love","v06/c003"],
  ["Vol.06 Ch.004: The Mirror of Truth","v06/c004"],
  ["Vol.06 Ch.005: Small Miracle","v06/c005"],
  ["Vol.06 Ch.006: I Think Therefore, I am","v06/c006"],
  ["Vol.06 Ch.007: Vampire Doll Na-Zan","v06/c007"],
  ["Vol.06 Ch.007.5: Extra","v06/c007.5"]
);

var total_chapters = 13;

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;