var chap_array = new Array(
    ["6 - Because I Used to be Like that Too",'6'],

    ["5 - Those Who Have Good Eyesight, Get Outta My Way",'5'],

    ["4 - The Meat's Gonna Get Cold",'4'],

    ["3 - Isn't Everything Yankee-kun's Fault",'3'],

    ["2 - Minus 10 Points Equals Repeat",'2'],

    ["1 - Future Plans Survey",'1'],

    ["Prologue Sit - It's Because I Like You, Shinagawa",'.3'],

    ["Prologue Bow",'.2'],

    ["Prologue Stand",'.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]);
    }
}