var chapter_list = new Array(
  ["Vol.01 Ch.001: [Includes chapters 1-3]","v01/c001"],
  ["Vol.01 Ch.004: [Includes chapters 4, 5 & Extra Edition]","v01/c004"],
  ["Vol.02 Ch.006: [Includes chapters 6-8]","v02/c006"],
  ["Vol.02 Ch.008.2: 8 [continuation] \ Akaiito -Hanakageshou-","v02/c008.2"],
  ["Vol.03 Ch.009","v03/c009"],
  ["Vol.03 Ch.010","v03/c010"],
  ["Vol.03 Ch.011","v03/c011"],
  ["Vol.03 Ch.012","v03/c012"],
  ["Vol.03 Ch.013: [Last Story] \ [Extra Edition]","v03/c013"]
);

var total_chapters = 9;

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;