var chap_array = new Array(
    ["19 - The Kamikakushi Murders Part 3",'19/01'],

    ["18 - The Kamikakushi Village Murders 2",'18/01'],

    ["17 - The Kamikakushi Village Murders - Part 1",'17/01'],

    ["16 - Class Begins at Detective School - Part 3",'16/01'],

    ["15 - Class Begins at Detective School - Part 2",'15/01'],

    ["14 - Class Begins at Detective School - Part 1",'14/00-cover'],

    ["13 - The Tragedy of Kirisaki Island - Part 10",'13/01'],

    ["12 - The Tragedy of Kirisaki Island - Part 9",'12/01'],

    ["11 - The Tragedy of Kirisaki Island - Part 8",'11/01'],

    ["10 - The Tragedy of Kirisaki Island - Part 7",'10/01'],

    ["9 - The Tragedy of Kirisaki Island - Part 6",'9/01'],

    ["8 - The Tragedy of Kirisaki Island - Part 5",'8/01'],

    ["7 - The Tragedy of Kirisaki Island - Part 4",'7/01'],

    ["6 - The Tragedy of Kirisaki Island - Part 3",'6/00-cover'],

    ["5 - The Tragedy of Kirisaki Island - Part 2",'5/01'],

    ["4 - The Tragedy of Kirisaki Island",'4/01'],

    ["3 - Detective School Entrance Exam - Part 3",'3/01'],

    ["2 - Detective School Entrance Exam - Part 2",'2/01'],

    ["1 - Detective School Entrance Exam - Part 1",'1/00-cover']
);
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]);
    }
}