var chapter_list = new Array(
  ["Vol.01 Ch.001: Story 1 ''Arrested man''","v01/c001"],
  ["Vol.01 Ch.002: Story 2 ''Memories of the Snow''","v01/c002"],
  ["Vol.01 Ch.003: Story 3 ''Ugokenai Yoru''","v01/c003"],
  ["Vol.01 Ch.004: Story 4 ''Naive Gespenst''","v01/c004"],
  ["Vol.01 Ch.005: Story 5 ''Toiki no Netsu''","v01/c005"],
  ["Vol.01 Ch.006: Story 6 "Shisen no Katachi "","v01/c006"],
  ["Vol.01 Ch.007: Story 7 "Body by Body"","v01/c007"]
);

var total_chapters = 7;

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;