var chap_array = new Array(
["A Girls 8 - Chapter 8",'a-girls-8'],
["A Girls 7 - Chapter 7",'a-girls-7'],
["A Girls 6 - Chapter 6",'a-girls-6'],
["A Girls 5 - Chapter 5",'a-girls-5'],
["A Girls 4 - Chapter 4",'a-girls-4'],
["A Girls 3 - Chapter 3",'a-girls-3'],
["A Girls 2 - Chapter 2",'a-girls-2'],
["A Girls 1 - Chapter 1",'a-girls-1']);

for (var i=0; i<chap_array.length; i++) {
document.getElementById('chapter_select').options[i] = new Option(chap_array[i][0],chap_array[i][1]);
}