var chapter_list = new Array(
  ["Vol.01 Ch.001: The Male Sex Servant","v01/c001"],
  ["Vol.01 Ch.002: Please Train","v01/c002"],
  ["Vol.01 Ch.003: Memories","v01/c003"],
  ["Vol.01 Ch.004: Make It Nothing Else But A Body","v01/c004"],
  ["Vol.01 Ch.005: The Sweetened Pastry That Fell in Love","v01/c005"],
  ["Vol.02 Ch.006: The Way to Love","v02/c006"],
  ["Vol.02 Ch.007: Aiko Attacks","v02/c007"],
  ["Vol.02 Ch.008: Three Pink Days","v02/c008"],
  ["Vol.02 Ch.009: The Bad Little Devil","v02/c009"],
  ["Vol.02 Ch.010: Aiko's Plea (Absolutely Not! By Shiina)","v02/c010"],
  ["Vol.03 Ch.011: The Nobleman's Daughter Inside A Box","v03/c011"],
  ["Vol.03 Ch.012: The Knight in Glasses","v03/c012"],
  ["Vol.03 Ch.013: Reunion","v03/c013"],
  ["Vol.03 Ch.014","v03/c014"],
  ["Vol.03 Ch.015","v03/c015"],
  ["Vol.04 Ch.016: The Real Keisuke","v04/c016"],
  ["Vol.04 Ch.017: Melted Ice","v04/c017"],
  ["Vol.04 Ch.018: The Night that Doesn't Dawn","v04/c018"],
  ["Vol.04 Ch.019","v04/c019"],
  ["Vol.04 Ch.020","v04/c020"],
  ["Vol.05 Ch.021: Borderline","v05/c021"],
  ["Vol.05 Ch.022","v05/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;