var chap_array = new Array(
    ["24 - The Last Cruise",'24'],

    ["23 - Last Moments",'23'],

    ["22 - Clash",'22'],

    ["21 - Encounter",'21'],

    ["20 - Complete Disorder",'20'],

    ["19 - Enemy",'19'],

    ["18 - Parting",'18'],

    ["17 - Chaos",'17'],

    ["16 - Riot",'16'],

    ["15 - Divisons",'15'],

    ["14 - Alignment",'14'],

    ["13 - Red Sea",'13'],

    ["12 - Declaration of War",'12'],

    ["11 - Previous Omen",'11'],

    ["10 - Summons",'10'],

    ["9 - Galph and the Object",'9'],

    ["8 - Galph Jyunou",'8'],

    ["7 - Extinction",'7'],

    ["6 - Summer and the Dragon",'6'],

    ["5 - Smile",'5'],

    ["4 - Lucky Star",'4'],

    ["3 - Error",'3'],

    ["2 - Abandoned Human",'2'],

    ["1 - The Playground on the Sea",'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]);
    }
}