var chapter_list = new Array(
  ["Vol.01 Ch.001: July 16th","v01/c001"],
  ["Vol.01 Ch.002: July 17th Part 1","v01/c002"],
  ["Vol.01 Ch.003: July 17th Part 2","v01/c003"],
  ["Vol.01 Ch.004: July 18th Part 1","v01/c004"],
  ["Vol.01 Ch.005: July 18th Part 2","v01/c005"],
  ["Vol.01 Ch.006: July 19th Part 1","v01/c006"],
  ["Vol.01 Ch.007: July 19th Part 2","v01/c007"],
  ["Vol.02 Ch.008: July 20th","v02/c008"],
  ["Vol.02 Ch.008.5: Special","v02/c008.5"],
  ["Vol.02 Ch.009: July 21st Part 1","v02/c009"],
  ["Vol.02 Ch.010: July 21st Part 2","v02/c010"],
  ["Vol.02 Ch.011: July 24th Part 1","v02/c011"],
  ["Vol.02 Ch.012: July 24th Part 2","v02/c012"],
  ["Vol.02 Ch.013: July 24th Part 3","v02/c013"],
  ["Vol.03 Ch.014: July 24th Part 4","v03/c014"],
  ["Vol.03 Ch.015: July 24th Part 5","v03/c015"],
  ["Vol.03 Ch.016: July 24th Part 6","v03/c016"],
  ["Vol.03 Ch.017: A Certain Student's Epilogue","v03/c017"],
  ["Vol.03 Ch.017.1: Special Chapter: A Certain Two People's Training (1st Part)","v03/c017.1"],
  ["Vol.03 Ch.017.2: Special Chapter: A Certain Two People's Training (2nd Part)","v03/c017.2"],
  ["Vol.04 Ch.018: August 10th","v04/c018"],
  ["Vol.04 Ch.019: August 10th Part 2","v04/c019"],
  ["Vol.04 Ch.019.5: August 10th Part 3","v04/c019.5"],
  ["Vol.04 Ch.020: August 11th/May 11th","v04/c020"],
  ["Vol.04 Ch.021: August 12th","v04/c021"],
  ["Vol.04 Ch.022: August 12th Part 2","v04/c022"],
  ["Vol.04 Ch.023: August 12th Part 3","v04/c023"],
  ["Vol.04 Ch.024: August 12th Part 4","v04/c024"],
  ["Vol.04 Ch.025: August 15th-18th","v04/c025"]
);

var total_chapters = 29;

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;