var chap_array = new Array(
    ["52 - Kana Ushiro 5",'52'],

    ["51 - Kana Ushiro 4",'51'],

    ["50 - Kana Ushiro 3",'50'],

    ["49 - Kana Ushiro 2",'49'],

    ["48 - Kana Ushiro 1",'48'],

    ["47 - Kanji Yoshikawa 5",'47'],

    ["46 - Kanji Yoshikawa 4",'46'],

    ["45 - Kanji Yoshikawa 3",'45'],

    ["44 - Kanji Yoshikawa 2",'44'],

    ["43 - Kanji Yoshikawa 1",'43'],

    ["42 - Aiko Tokosumi 5",'42'],

    ["41 - Aiko Tokosumi 4",'41'],

    ["40 - Aiko Tokosumi 3",'40'],

    ["39 - Aiko Tokosumi 2",'39'],

    ["38 - Aiko Tokosumi 1",'38'],

    ["37 - Takami Komoda 5",'37'],

    ["36 - Takami Komoda 4",'36'],

    ["35 - Takami Komoda 3",'35'],

    ["34 - Takami Komoda 2",'34'],

    ["33 - Takami Komoda 1",'33'],

    ["32 - Yosuke Kirie 4",'32'],

    ["31 - Yosuke Kirie 3",'31'],

    ["30 - Yosuke Kirie 2",'30'],

    ["29 - Yosuke Kirie 1",'29'],

    ["28 - Maki Ano 4",'28'],

    ["27 - Maki Ano 3",'27'],

    ["26 - Maki Ano 2",'26'],

    ["25 - Maki Ano 1",'25'],

    ["24 - Kunihiko Moji 4",'24'],

    ["23 - Kunihiko Moji 3",'23'],

    ["22 - Kunihiko Moji 2",'22'],

    ["21 - Kunihiko Moji 1",'21'],

    ["20 - Chizuru Honda 4",'20'],

    ["19 - Chizuru Honda 3",'19'],

    ["18 - Chizuru Honda 2",'18'],

    ["17 - Chizuru Honda 1",'17'],

    ["16 - Isao Kako 4",'16'],

    ["15 - Isao Kako 3",'15'],

    ["14 - Isao Kako 2",'14'],

    ["13 - Isao Kako 1",'13'],

    ["12 - Mako Nakarai 3",'12'],

    ["11 - Mako Nakarai 2",'11'],

    ["10 - Mako Nakarai 1",'10'],

    ["9 - Daiichi Yamura 2",'9'],

    ["8 - Daiichi Yamura 1",'8'],

    ["7 - Masaru Kodaka 2",'7'],

    ["6 - Masaru Kodaka 1",'6'],

    ["5 - Takashi Waku 2",'5'],

    ["4 - Takashi Waku 1",'4'],

    ["3 - Kokopelli 3",'3'],

    ["2 - Kokopelli 2",'2'],

    ["1 - Kokopelli 1",'1']
);
for (var i=0; i<chap_array.length; i++) {
    document.getElementById('id_chapter_1').options[i] = new Option(chap_array[i][0],chap_array[i][1]);
    if (document.getElementById('id_chapter_2')) {
        document.getElementById('id_chapter_2').options[i] = new Option(chap_array[i][0],chap_array[i][1]);
    }
}