var chap_array = new Array(
    ["24 - More Than Her",'24'],

    ["23 - What She Doesn't Know",'23'],

    ["22 - Her Unknown Tragedy",'22'],

    ["21 - Her Determination",'21'],

    ["20 - Her Confusion",'20'],

    ["19 - Her Secret",'19'],

    ["18 - Her Pain",'18'],

    ["17 - The Same as Her",'17'],

    ["16 - Running into Her",'16'],

    ["15 - Her Feelings",'15'],

    ["14 - Her Request",'14'],

    ["13 - Good Night to Her",'13'],

    ["12 - Her Horror",'12'],

    ["11 - Her Tradegy",'11'],

    ["10 - Her Nightmare",'10'],

    ["9 - For Her",'9'],

    ["8 - Her Traces",'8'],

    ["7 - That Close Girl",'7'],

    ["6 - That Distant Girl",'6'],

    ["5 - Her Love",'5'],

    ["4 - That Special Girl",'4'],

    ["3 - When She Smiles",'3'],

    ["2 - Her Wound",'2'],

    ["1 - Her Confession",'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]);
    }
}