var chap_array = new Array(
    ["I Live at 2-2-6",'6.3/01'],

    ["Mayonnaise",'6.2/01'],

    ["Cloudy Wednesday",'6.1/01'],

    ["5 - Return to the Country",'5/01'],

    ["4 - The Procession",'4/01'],

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

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

    ["1 - Michiko Tai",'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]);
    }
}