var chap_array = new Array(
    ["13 - Multiplies2",'13'],

    ["12 - Multiplies",'12'],

    ["11 - Snow Light",'11'],

    ["10 - Cockroach",'10'],

    ["9 - Fake",'9'],

    ["8 - Beautiful World",'8'],

    ["Extra - Movie Star",'7.1'],

    ["7 - Hold Me Tight",'7'],

    ["6 - Unhappy Birthday",'6'],

    ["5 - God and Dog",'5'],

    ["4 - Cosmetic Surgery",'4'],

    ["3 - Take to Pieces",'3'],

    ["2 - Chrysalis",'2'],

    ["1 - Brains",'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]);
    }
}