var chapter_list = new Array(
  ["Ch.001","c001"],
  ["Ch.002","c002"],
  ["Ch.003","c003"],
  ["Ch.004","c004"],
  ["Ch.005","c005"],
  ["Ch.006","c006"],
  ["Ch.007","c007"],
  ["Ch.008","c008"],
  ["Ch.009","c009"],
  ["Ch.010","c010"],
  ["Ch.011","c011"],
  ["Ch.012","c012"],
  ["Ch.013","c013"],
  ["Ch.014","c014"],
  ["Ch.015","c015"],
  ["Ch.016","c016"],
  ["Ch.017","c017"],
  ["Ch.018","c018"],
  ["Ch.019","c019"],
  ["Ch.020","c020"],
  ["Ch.021","c021"],
  ["Ch.022","c022"],
  ["Ch.023","c023"],
  ["Ch.024","c024"],
  ["Ch.025","c025"],
  ["Ch.026","c026"],
  ["Ch.027","c027"],
  ["Ch.028","c028"],
  ["Ch.029","c029"],
  ["Ch.030","c030"],
  ["Ch.030.5: Family Outing - Side Story","c030.5"],
  ["Ch.031","c031"],
  ["Ch.032","c032"],
  ["Ch.033","c033"],
  ["Ch.034","c034"],
  ["Ch.035","c035"],
  ["Ch.035.5: Christmas Special","c035.5"],
  ["Ch.036","c036"],
  ["Ch.037","c037"],
  ["Ch.038","c038"],
  ["Ch.039","c039"],
  ["Ch.040","c040"],
  ["Ch.041","c041"],
  ["Ch.042","c042"],
  ["Ch.043","c043"],
  ["Ch.044","c044"],
  ["Ch.045","c045"],
  ["Ch.046","c046"],
  ["Ch.047","c047"],
  ["Ch.048","c048"],
  ["Ch.049","c049"],
  ["Ch.050","c050"],
  ["Ch.051","c051"],
  ["Ch.052","c052"],
  ["Ch.053","c053"],
  ["Ch.054","c054"],
  ["Ch.055","c055"],
  ["Ch.056","c056"],
  ["Ch.057","c057"],
  ["Ch.058","c058"],
  ["Ch.059","c059"],
  ["Ch.060","c060"]
);

var total_chapters = 62;

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;