var chap_array = new Array(
["Strange Orange 6",'strange-orange-6'],
["Strange Orange 5",'strange-orange-5'],
["Strange Orange 4",'strange-orange-4'],
["Strange Orange 3",'strange-orange-3'],
["Strange Orange 2",'strange-orange-2'],
["Strange Orange 1",'strange-orange-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]);
}