var chap_array = new Array(
    ["8 - Doll Shop",'8/01'],

    ["7 - Me Inside the Mirror",'7/01'],

    ["6 - Message SOS",'6/01'],

    ["5 - The Show-Off Ghost",'5/00'],

    ["4 - Forest Memory",'4/01'],

    ["3 - I See a Hen",'3/01'],

    ["2 - I Want You Close",'2/01'],

    ["1 - Welcome to the World of the Picture Book",'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]);
    }
}