var chapter_list = new Array(
  ["Vol.01 Ch.001: The Nightmare Trip to the Digital World","v01/c001"],
  ["Vol.01 Ch.002: To the Depths of Evil","v01/c002"],
  ["Vol.01 Ch.003: Masuken's Trap","v01/c003"],
  ["Vol.01 Ch.004: Loss of the Dragon Spirit","v01/c004"],
  ["Vol.01 Ch.005: 3 Tests","v01/c005"],
  ["Vol.01 Ch.006: Battle of Courage","v01/c006"],
  ["Vol.01 Ch.007: 2nd Generation Evolution!!","v01/c007"],
  ["Vol.02 Ch.008: Partner and Digimon as One","v02/c008"],
  ["Vol.02 Ch.009: Grade Without Arms","v02/c009"],
  ["Vol.02 Ch.010: Duke's Appearance","v02/c010"],
  ["Vol.02 Ch.011: Reborn","v02/c011"],
  ["Vol.02 Ch.012: Saving a Friend","v02/c012"],
  ["Vol.02 Ch.013: Leader of the Holy Knights","v02/c013"],
  ["Vol.02 Ch.014: Miraculous Ending","v02/c014"]
);

var total_chapters = 14;

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;