var chapter_list = new Array(
  ["Vol.01 Ch.001: Story #1","v01/c001"],
  ["Vol.01 Ch.002: Story #1","v01/c002"],
  ["Vol.01 Ch.003: Story #2","v01/c003"],
  ["Vol.01 Ch.004: Story #3","v01/c004"],
  ["Vol.02 Ch.000: 1001 Nights with You (ch 1-3) + He's 100% SILK","v02/c000"],
  ["Vol.03 Ch.004: 1001 Nights with You: The Passion Ramadan","v03/c004"],
  ["Vol.03 Ch.005: 1001 Nights with You: The Sultan's Palace","v03/c005"],
  ["Vol.03 Ch.006: 1001 Nights with You: The Odalisque of Maru-no-Uchi","v03/c006"],
  ["Vol.03 Ch.007: 1001 Nights with You: Jihad","v03/c007"],
  ["Vol.03 Ch.008: 1001 Nights with You: Alladin's Lamp","v03/c008"],
  ["Vol.04 Ch.009: 1001 Nights with You: Vessel to the Moon","v04/c009"],
  ["Vol.04 Ch.010: 1001 Nights with You: The Phantom City","v04/c010"]
);

var total_chapters = 12;

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;