var chap_array = new Array(
    ["5 - Dried Fish's First Sleep Over",'5'],

    ["4 - Dried Fish's Stormy Night",'4'],

    ["3 - Dried Fish's Big Strategy for a Date",'3'],

    ["2 - Dried Fish's Love, First Step",'2'],

    ["1 - Dried Fish, Thrown into the Ocean",'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]);
    }
}