var chapter_list = new Array(
  ["Vol.01 Ch.001: Island","v01/c001"],
  ["Vol.01 Ch.002: Hole","v01/c002"],
  ["Vol.01 Ch.003: Flour","v01/c003"],
  ["Vol.01 Ch.004: Something Purple","v01/c004"],
  ["Vol.01 Ch.005: Direct Contact","v01/c005"],
  ["Vol.01 Ch.006: Intruder","v01/c006"],
  ["Vol.01 Ch.007: Final Disposal","v01/c007"],
  ["Vol.01 Ch.008: Beach","v01/c008"],
  ["Vol.01 Ch.009: Binoculars","v01/c009"],
  ["Vol.01 Ch.010: Scum","v01/c010"],
  ["Vol.01 Ch.011: Emergency Motion","v01/c011"],
  ["Vol.02 Ch.012: Physical Ejection","v02/c012"],
  ["Vol.02 Ch.013: Reenactment Drama","v02/c013"],
  ["Vol.02 Ch.014: Inquisition","v02/c014"],
  ["Vol.02 Ch.015: Mutilation","v02/c015"],
  ["Vol.02 Ch.016: Dismissal of Chairman","v02/c016"],
  ["Vol.02 Ch.017: Happy Times","v02/c017"],
  ["Vol.02 Ch.018: New Chairman","v02/c018"],
  ["Vol.02 Ch.019: Wonderful News","v02/c019"],
  ["Vol.02 Ch.020: The Land of Comfort","v02/c020"],
  ["Vol.02 Ch.021: New Men","v02/c021"],
  ["Vol.02 Ch.022: Exodus from Babylon on a Boat","v02/c022"]
);

var total_chapters = 22;

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;