var chap_array = new Array(
    ["22 - Lake Bag Ghost House",'22'],

    ["21 - Dead End Summer Vacation",'21'],

    ["20 - Honeycomb Summer night",'20'],

    ["19 - Dozing Seaweed Garden",'19'],

    ["18 - Summer Vacation of Betrayal",'18'],

    ["17 - Summer Vacation of Slaughter",'17'],

    ["16 - Raccoon Dog Blues",'16'],

    ["15 - Inugami and the Girl",'15'],

    ["14 - Anger Outburst Dandy",'14'],

    ["13 - The Yamato Amongst Women",'13'],

    ["12 - The Forbidden Men's Bathroom",'12'],

    ["11 - The Immortal One",'11'],

    ["10 - Sayonara Tokyo Ondo",'10'],

    ["9 - Sayonara, Tokyo March",'9'],

    ["8 - Beginning of the End",'8'],

    ["7 - Oh My God Girl",'7'],

    ["6 - Trash Mountain Requiem",'6'],

    ["5 - True Romance on a Snowy Mountain",'5'],

    ["4 - Duel Inside Deni",'4'],

    ["3 - Christmas Date",'3'],

    ["2 - After School, Underground",'2'],

    ["1 - The Girl on the Edge",'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]);
    }
}