var chapter_list = new Array(
  ["Vol.01 Ch.000","v01/c000"],
  ["Vol.01 Ch.001: Mother and I are good friends... you know","v01/c001"],
  ["Vol.01 Ch.002: Mother and I are good friends... you know","v01/c002"],
  ["Vol.01 Ch.003: Mother and I are good friends... you know","v01/c003"],
  ["Vol.01 Ch.004: Mother and I are good friends... you know","v01/c004"],
  ["Vol.01 Ch.005: Mother and I are good friends... you know","v01/c005"],
  ["Vol.01 Ch.006: Mother and I are good friends... you know","v01/c006"],
  ["Vol.01 Ch.007: Mother and I are good friends... you know","v01/c007"],
  ["Vol.01 Ch.008: Mother and I are good friends... you know","v01/c008"],
  ["Vol.01 Ch.009: Mother and I are good friends... you know","v01/c009"],
  ["Vol.01 Ch.010: Mother and I are good friends... you know","v01/c010"],
  ["Vol.01 Ch.011: Mother and I are good friends... you know","v01/c011"],
  ["Vol.01 Ch.012: Mother and I are good friends... you know","v01/c012"],
  ["Vol.01 Ch.013: Mother and I are good friends... you know","v01/c013"],
  ["Vol.01 Ch.014: Mother and I are good friends... you know","v01/c014"],
  ["Vol.01 Ch.015: Mother and I are good friends... you know","v01/c015"],
  ["Vol.01 Ch.016: Mother and I are good friends... you know","v01/c016"],
  ["Vol.01 Ch.017: Mother and I are good friends... you know","v01/c017"],
  ["Vol.01 Ch.018: Mother and I are good friends... you know","v01/c018"],
  ["Vol.02 Ch.000","v02/c000"],
  ["Vol.02 Ch.001","v02/c001"],
  ["Vol.02 Ch.002: Mom and I are Best Friends","v02/c002"],
  ["Vol.02 Ch.003: Mighty ShinChan Heedless of the winter winds","v02/c003"],
  ["Vol.02 Ch.004: Kindergarten is a Fun, Fun Paradise","v02/c004"],
  ["Vol.03 Ch.000","v03/c000"],
  ["Vol.04 Ch.000","v04/c000"]
);

var total_chapters = 26;

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;