var chap_array = new Array(
    ["Flashback - Asumi's Sakura",'13.1/01'],

    ["13 - Mission 13",'13/01'],

    ["12 - Mission 12",'12/01'],

    ["11 - Mission 11",'11/01'],

    ["10 - Mission 10",'10/01'],

    ["9 - Mission 9",'9/00-cover'],

    ["Flashback - Our Star, the Leaf Star",'8.2/01'],

    ["Flashback - Campanelra's Forest",'8.1/01'],

    ["8 - Mission 8",'8/01'],

    ["7 - Mission 7",'7/01'],

    ["6 - Mission 6",'6/01'],

    ["5 - Mission 5",'5/00-cover'],

    ["Flashback - Asumi",'4.2/01'],

    ["Flashback - Firework Launch of 2015",'4.1/01'],

    ["4 - Mission 4",'4/01'],

    ["3 - Mission 3",'3/01'],

    ["2 - Mission 2",'2/01'],

    ["1 - Mission 1",'1/00-cover']
);
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]);
    }
}