var chap_array = new Array(
    ["16 - Gate",'16/01'],

    ["15 - The Same Thought",'15/01'],

    ["14 - Tomorrow",'14/01'],

    ["13 - Hero",'13/00'],

    ["12 - It Seems To Be Itself",'12/01'],

    ["11 - Believe",'11/01'],

    ["10 - Pride",'10/01'],

    ["9 - A Tool Or A Comrade",'9/01'],

    ["8 - Dragonic Heaven",'8/01'],

    ["7 - A Sucessor",'7/01'],

    ["6 - Another World",'6/01'],

    ["5 - A Seal Is Solved",'5/01'],

    ["4 - Awakening",'4/01-02'],

    ["3 - Revenge",'3/01'],

    ["2 - Dive",'2/01'],

    ["1 - D Break",'1/01']
);
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]);
    }
}