var chap_array = new Array(
    ["11 - Triangle House",'11'],

    ["10 - From Her to Eternity",'10'],

    ["9 - Comic Strip",'9'],

    ["8 - So Gloomy That I Could Die",'8'],

    ["7 - More Gentle",'7'],

    ["6 - Lemon Innocent",'6'],

    ["5 - You're Under Arrest",'5'],

    ["4 - Graduation",'4'],

    ["3 - Wolf Boy",'3'],

    ["2 - Tandem",'2'],

    ["1 - Be My Baby",'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]);
    }
}