var chap_array = new Array(
    ["30 - Happy Happy Birthday",'30/01'],

    ["29 - Good Bye",'29/01'],

    ["28 - Parting Prelude",'28/01'],

    ["27 - Pursuit! Land, Water, Air",'27/01'],

    ["26 - The Day I Became a Cat",'26/01'],

    ["25 - I am a Bear - Second Half",'25/01'],

    ["24 - I am a Bear - First Half",'24/01'],

    ["23 - Human Denial and Doubt - Human",'23/01'],

    ["22 - Human Denial and Doubt - Overload",'22/01'],

    ["21 - Human Denial and Doubt - MAD",'21/01'],

    ["20 - Human Denial and Doubt - Vektor",'20/01'],

    ["19 - Human Denial and Doubt - R",'19/01'],

    ["18 - Memorial Medley of Summer",'18/01'],

    ["17 - Screw Lady - Promise of Change",'17/01'],

    ["16 - Screw Lady - The Screw Bracelet",'16/01'],

    ["15 - Screw Lady - The Present",'15/01'],

    ["14 - Screw Lady - Funaki Umi",'14/01'],

    ["13 - Quiz War",'13/01'],

    ["12 - RP vs CQ - Battle 3 Results",'12/01'],

    ["11 - RP vs CQ - Battle 2 Honest",'11/01'],

    ["10 - RP vs CQ - Battle 1 Start",'10/01'],

    ["9 - Caterpillar Queen 3, Caterpillar Reborn",'9/01'],

    ["8 - Caterpillar Queen 2, Principal's Proposition",'8/01'],

    ["7 - Caterpillar Queen 1, Daichi Mikado",'7/01'],

    ["6 - Narrative of a Hard-fought Date",'6/01'],

    ["5 - Dear My Little Friend",'5/01'],

    ["4 - The Stolen Rocket",'4/01'],

    ["3 - Kohime Goes to School",'3/01'],

    ["2 - Reliable Knight",'2/01'],

    ["1 - Happy Birthday",'1/00']
);
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]);
    }
}