var chapter_list = new Array(
  ["Ch.001.1: Beloved Teddy Bear","c001.1"],
  ["Ch.001.2: [continuation]","c001.2"],
  ["Ch.001.3: [continuation]","c001.3"],
  ["Ch.001.4: [continuation]","c001.4"],
  ["Ch.001.5: [continuation]","c001.5"],
  ["Ch.003: When I Was Young","c003"],
  ["Ch.004: Boy - Girl","c004"]
);

var total_chapters = 7;

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;