var chap_array = new Array(
    ["36",'36/00-cover'],

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

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

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

    ["32",'32/01'],

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

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

    ["29",'29/00'],

    ["28 - Volume04 Chapter28",'28/01'],

    ["27 - Volume04 Chapter27",'27/00'],

    ["26 - Volume04 Chapter26",'26/01'],

    ["25 - Volume04 Chapter25",'25/00'],

    ["24 - Volume04 Chapter24",'24/00'],

    ["23 - Volume04 Chapter23",'23/001'],

    ["22 - Volume04 Chapter22",'22/01'],

    ["21 - Volume03 Chapter21",'21/00'],

    ["20 - Volume03 Chapter20",'20/02'],

    ["19 - Volume03 Chapter19",'19/02'],

    ["18 - Volume03 Chapter18",'18/000'],

    ["17 - Volume03 Chapter17",'17/057'],

    ["16 - Volume03 Chapter16",'16/029'],

    ["15 - Volume03 Chapter15",'15/003'],

    ["14 - Volume02 Chapter14",'14/165'],

    ["13 - Volume02 Chapter13",'13/135'],

    ["12 - Volume02 Chapter12",'12/109'],

    ["11 - Volume02 Chapter11",'11/081'],

    ["10 - Volume02 Chapter10",'10/055'],

    ["9 - Volume02 Chapter09",'9/029'],

    ["8 - Volume02 Chapter08",'8/003'],

    ["7 - Volume01 Chapter07",'7/169'],

    ["6 - Volume01 Chapter06",'6/143'],

    ["5 - Volume01 Chapter05",'5/117'],

    ["4 - Volume01 Chapter04",'4/089'],

    ["3 - Volume01 Chapter03",'3/063'],

    ["2 - Volume01 Chapter02",'2/037'],

    ["1 - Volume01 Chapter01",'1/000']
);
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]);
    }
}