var chap_array = new Array(
    ["33 - Forever Boyfriend",'33'],

    ["32 - Of Course",'32'],

    ["31 - Warm and Pretty Lies",'31'],

    ["30 - Fight for the Girlfriend",'30'],

    ["29 - I'm Sorry",'29'],

    ["28 - A Nurse's Job",'28'],

    ["27 - I'm Thinking of You",'27'],

    ["26 - Both of Them",'26'],

    ["25 - Itsy-Bitsy Boyfriend",'25'],

    ["24 - Open Your Eyes",'24'],

    ["23 - Maintenance",'23'],

    ["22 - New Model",'22'],

    ["21 - Secrets",'21'],

    ["20 - A Big Problem",'20'],

    ["19 - My First Love",'19'],

    ["18 - Unforgivable",'18'],

    ["17 - My Real Feelings",'17'],

    ["16 - Be With Me",'16'],

    ["15 - The Use of Force",'15'],

    ["14 - Sex",'14'],

    ["13 - Return",'13'],

    ["12 - Ex-GF",'12'],

    ["11 - Kiss",'11'],

    ["10 - The One I Love",'10'],

    ["9 - Thanks",'9'],

    ["8 - Friends",'8'],

    ["7 - Off-Campus Homeroom",'7'],

    ["6 - Lets Go to School",'6'],

    ["5 - Dinner",'5'],

    ["4 - The Hundred Million Yen Man",'4'],

    ["3 - A Honorable Purchase",'3'],

    ["2 - Three Day Boyfriend",'2'],

    ["1 - Lover Shop",'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]);
    }
}