var chapter_list = new Array(
  ["Vol.01 Ch.001: Big Brothers, Little Brother","v01/c001"],
  ["Vol.01 Ch.002: Dero!","v01/c002"],
  ["Vol.01 Ch.003: Pink, Right?","v01/c003"],
  ["Vol.01 Ch.004: He's Late","v01/c004"],
  ["Vol.01 Ch.005: One Long Dream","v01/c005"],
  ["Vol.01 Ch.006: A Story of Love and Patience","v01/c006"],
  ["Vol.02 Ch.007: Even After Death, A Childhood Friend Is Still a Childhood Friend","v02/c007"],
  ["Vol.02 Ch.008: He cried enough for a decade","v02/c008"],
  ["Vol.02 Ch.009: My Rival","v02/c009"],
  ["Vol.02 Ch.010: Manga Tengu","v02/c010"],
  ["Vol.02 Ch.011: He Was My First Love","v02/c011"],
  ["Vol.02 Ch.012: You Could Have Just Told Me...","v02/c012"]
);

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;