var chapter_list = new Array(
  ["Vol.08 Ch.037: Resuming","v08/c037"],
  ["Vol.08 Ch.038: Enemy: Gourry!","v08/c038"],
  ["Vol.08 Ch.039: Lina's Resolve","v08/c039"],
  ["Vol.08 Ch.040: Sairaag, City of the Dead","v08/c040"],
  ["Vol.08 Ch.041: Hell Master's Game","v08/c041"],
  ["Vol.08 Ch.042: Lord of Nightmares","v08/c042"],
  ["Vol.08 Ch.043: Lina’s Return (Final)","v08/c043"],
  ["Vol.08 Ch.044: Super Extra Chapter - Summer!!","v08/c044"]
);

var total_chapters = 8;

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;