var chap_array = new Array(
    ["17 - Volume 3 Chapter 17",'17/01'],

    ["16 - Volume 3 Chapter 16",'16/01'],

    ["15 - Volume 3 Chapter 15",'15/01'],

    ["14 - Volume 3 Chapter 14",'14/My_Girl_v03_c14_Credits'],

    ["13 - Volume 3 Chapter 13",'13/My_Girl_v03_c13_Cover'],

    ["12 - Volume 2 Chapter 12",'12/My_Girl_v02_c12_credits'],

    ["11 - Volume 2 Chapter 11",'11/My_Girl_v02_c11_credits'],

    ["10 - Volume 2 Chapter 10",'10/01'],

    ["9 - Volume 2 Chapter 9",'9/My_Girl_v02_c09_Credits'],

    ["8 - Volume 2 Chapter 8",'8/My_Girl_v02_c08_Credits'],

    ["7 - Volume 2 Chapter 7",'7/My_Girl_v02_c07_Cover'],

    ["6 - Volume 1 Chapter 6",'6/My_Girl_v01_c06_p00'],

    ["5 - Volume 1 Chapter 5",'5/My-Girl-v01-c05-p00a'],

    ["4 - Volume 1 Chapter 4",'4/My_Girl_v01_c04_Credits'],

    ["3 - Volume 1 Chapter 3",'3/My-Girl-v01-c03-p00'],

    ["2 - Volume 1 Chapter 2",'2/My_Girl_v01_c02_Credits'],

    ["1 - Volume 1 Chapter 1",'1/My_Girl_v01_c01_Credits']
);
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]);
    }
}