var chapter_list = new Array(
  ["Vol.01 Ch.001: Enter High School Student!","v01/c001"],
  ["Vol.01 Ch.002: Evidence, Guidance Group, Fan Club","v01/c002"],
  ["Vol.01 Ch.003: Proper Guidance Staff Possessed by Demons","v01/c003"],
  ["Vol.01 Ch.004: One Night at the Museum Part 1","v01/c004"],
  ["Vol.01 Ch.005: One Night at the Museum Part 2","v01/c005"],
  ["Vol.01 Ch.006: You Guys are the Spirits?","v01/c006"],
  ["Vol.01 Ch.007: Pro Exorcist. But...","v01/c007"],
  ["Vol.01 Ch.008: Transfer Student Na Rin?!","v01/c008"],
  ["Vol.01 Ch.009: A Liar and a Cute Girl","v01/c009"],
  ["Vol.01 Ch.010: Reveal Your Identity","v01/c010"],
  ["Vol.02 Ch.011: Reveal Your Identity!","v02/c011"],
  ["Vol.02 Ch.012: A Massive Spirit Sword Appears!","v02/c012"],
  ["Vol.02 Ch.013: Tide Turned","v02/c013"],
  ["Vol.02 Ch.014: Training! Training!","v02/c014"],
  ["Vol.02 Ch.015: Clash! Fan Club!","v02/c015"],
  ["Vol.02 Ch.016: Ghost of San Hae Kyung","v02/c016"],
  ["Vol.02 Ch.017: Summoner Yeo Woong-In","v02/c017"],
  ["Vol.02 Ch.018: Yeo Woong-In vs. Ah So-Ryun","v02/c018"],
  ["Vol.02 Ch.019: Battle Against Yeo Woong-In! Part 1","v02/c019"],
  ["Vol.02 Ch.020: Battle Against Yeo Woong-In! Part 2","v02/c020"],
  ["Vol.02 Ch.021: The Tengu & the School of Seo Ra Bul","v02/c021"]
);

var total_chapters = 21;

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;