var id_chapter_2 = new Array(
["1 - The Beginning of Summer","1","023"],
["2 - Our House","2","017"],
["3 - Sky and Magic","3","017"],
["4 - How to Make Friends","4","017"],
["5 - Everyone Friends","5","017"],
["6 - Summer Festival","6","017"],
["7 - Misuzu","7","021"],
["8 - Once Again","8","021"],
["9 - The First Wave","9","033"],
["10 - Answerless Day","10","021"],
["11 - Yukito","11","021"],
["12 - Wish","12","019"],
["13 - Truth","13","021"],
["14 - Family","14","021"],
["15 - Love, Once Again","15","060"]
);
for (var i = 0; i < id_chapter_2.length; i++) {
$('id_chapter_2').options[i+1] = new Option(id_chapter_2[i][0], id_chapter_2[i][1]);
$('id_chapter_1').options[i+1] = new Option(id_chapter_2[i][0], id_chapter_2[i][1]);
}
document.getElementById('id_chapter_1').value=current_chapter;
document.getElementById('id_chapter_2').value=current_chapter;