var chap_array = new Array(
    ["20 - A Beach for the Girls",'20'],

    ["19 - The Search for the Beach",'19'],

    ["18 - Mr Fujii and Taki",'18'],

    ["17 - Oww...",'17'],

    ["16 - The Real Pass",'16'],

    ["15 - Underhand Pass Practice",'15'],

    ["14 - Crash Course! The Turn Dash!",'14'],

    ["13 - The Sunset's Determination",'13'],

    ["12 - Four, United by Fate",'12'],

    ["11 - Conclusion! Hiratsuka Beach Park",'11'],

    ["10 - Turning Point",'10'],

    ["9 - Twister Parade",'9'],

    ["8 - Clash! Boys Against Girls",'8'],

    ["7 - The Falcon's Den",'7'],

    ["6 - For Tomorrow",'6'],

    ["5 - A Glimpse of Talent",'5'],

    ["4 - The Five Second Test",'4'],

    ["3 - Hiratsuka Park",'3'],

    ["2 - The Silent Angel",'2'],

    ["1 - Nanase Iruka",'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]);
    }
}