var chapter_list = new Array(
  ["Vol.01 Ch.001: Delicacy-chan","v01/c001"],
  ["Vol.01 Ch.002: Greedy-chan","v01/c002"],
  ["Vol.01 Ch.003: Unsolvable Mystery","v01/c003"],
  ["Vol.01 Ch.004: Exciting:  Mob","v01/c004"],
  ["Vol.01 Ch.005: Spoiled-chan","v01/c005"],
  ["Vol.01 Ch.006: Mr. Greenie","v01/c006"],
  ["Vol.01 Ch.007: Arena Time!♪","v01/c007"],
  ["Vol.01 Ch.008: True Feelings","v01/c008"],
  ["Vol.01 Ch.009: Mr. Polite","v01/c009"],
  ["Vol.01 Ch.010: Reality < Game","v01/c010"],
  ["Vol.01 Ch.011: Memories","v01/c011"],
  ["Vol.01 Ch.012: What to Do","v01/c012"],
  ["Vol.01 Ch.013: Peaco's Story","v01/c013"]
);

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;