var chap_array = new Array(
    ["56",'56/01'],

    ["55",'55/00'],

    ["54",'54/00'],

    ["53",'53/01'],

    ["52",'52/01'],

    ["51",'51/01'],

    ["50",'50/01'],

    ["49",'49/01'],

    ["48",'48/01'],

    ["47",'47/00'],

    ["46",'46/01'],

    ["45",'45/01'],

    ["44",'44/01'],

    ["43",'43/01'],

    ["42",'42/00'],

    ["41",'41/01'],

    ["40",'40/01'],

    ["39",'39/01'],

    ["38",'38/01'],

    ["37",'37/00'],

    ["36",'36/00'],

    ["35",'35/01'],

    ["34",'34/01'],

    ["33",'33/01'],

    ["32",'32/00'],

    ["31",'31/01'],

    ["30",'30/01'],

    ["29",'29/01'],

    ["28",'28/01'],

    ["27",'27/00'],

    ["26",'26/01'],

    ["25",'25/01'],

    ["24",'24/01'],

    ["23",'23/01'],

    ["22",'22/01'],

    ["21",'21/00'],

    ["20",'20/01'],

    ["19",'19/01'],

    ["18",'18/01'],

    ["17",'17/01'],

    ["16",'16/00'],

    ["15",'15/01'],

    ["14",'14/01'],

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

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

    ["11",'11/00'],

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

    ["9",'9/01'],

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

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

    ["6",'6/00'],

    ["5 - Volume 1 Extra One-Shot",'5/00'],

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

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

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

    ["1",'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]);
    }
}