var chap_array = new Array(
    ["6 - Should I Protect Her or Not",'6/01'],

    ["5 - Troubled Shingi",'5/00-note'],

    ["4 - Coward",'4/00-note'],

    ["3 - How in the World",'3/01'],

    ["2 - Boy Meets Girl",'2/00-note'],

    ["1 - My Way of Life",'1/00-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]);
    }
}