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

    ["12 - Entrapment",'12'],

    ["11 - Line of Site",'11'],

    ["10 - Spiral of Conciousness",'10'],

    ["9 - Tedlar Hunter",'9'],

    ["8 - A Lesson in Murder",'8'],

    ["7 - Confusion",'7'],

    ["6 - Distrustful Alliance",'6'],

    ["5 - Threat",'5'],

    ["4 - Girl's Trust",'4'],

    ["3 - The Girl Witness",'3'],

    ["2 - Invento",'2'],

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