var chapter_list = new Array(
  ["Vol.01 Ch.001: Genius Girl's Love","v01/c001"],
  ["Vol.01 Ch.002: Genius Girl's Q & A","v01/c002"],
  ["Vol.01 Ch.003: Genius Girl's First Date","v01/c003"],
  ["Vol.01 Ch.004: Genius Girl's Determination","v01/c004"],
  ["Vol.02 Ch.005.1: The Prodigy's Birthday","v02/c005.1"],
  ["Vol.02 Ch.005.2","v02/c005.2"],
  ["Vol.02 Ch.006: The Prodigy's Friend","v02/c006"],
  ["Vol.02 Ch.007: The Prodigy's Father","v02/c007"],
  ["Vol.02 Ch.008: The Prodigy's Obligation","v02/c008"],
  ["Vol.02 Ch.008.5: [Omake]","v02/c008.5"],
  ["Vol.03 Ch.009: Genius Girl's Math Trip (1/2)","v03/c009"],
  ["Vol.03 Ch.010: Prodigy's Educational Tour 2/2","v03/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;