var chapter_list = new Array(
  ["Vol.01 Ch.000: Prologue","v01/c000"],
  ["Vol.01 Ch.001: Seat Change","v01/c001"],
  ["Vol.01 Ch.002: After School","v01/c002"],
  ["Vol.01 Ch.003: Smile","v01/c003"],
  ["Vol.02 Ch.004: Rumors","v02/c004"],
  ["Vol.02 Ch.005: True Feelings","v02/c005"],
  ["Vol.02 Ch.006: Decision","v02/c006"],
  ["Vol.02 Ch.007: Friends","v02/c007"],
  ["Vol.03 Ch.008: Saturday Night","v03/c008"],
  ["Vol.03 Ch.009: Predicting Future","v03/c009"],
  ["Vol.03 Ch.010: New Friend","v03/c010"],
  ["Vol.03 Ch.011: Cooperation","v03/c011"],
  ["Vol.04 Ch.012: Special","v04/c012"],
  ["Vol.04 Ch.013: I Want To Know","v04/c013"],
  ["Vol.04 Ch.014: Feelings of Love","v04/c014"],
  ["Vol.04 Ch.015: Love","v04/c015"],
  ["Vol.04 Ch.016: Kurumi","v04/c016"],
  ["Vol.05 Ch.017: Rival","v05/c017"],
  ["Vol.05 Ch.018: Day Off","v05/c018"],
  ["Vol.05 Ch.019: Love of 1000 Cranes","v05/c019"],
  ["Vol.05 Ch.020","v05/c020"],
  ["Vol.06 Ch.021: Dream","v06/c021"],
  ["Vol.06 Ch.022: Mini Skirt","v06/c022"]
);

var total_chapters = 23;

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;