var chap_array = new Array(
["-Another- Xak 27",'%7C%7Canother%7C%7C-xak-27'],
["-Another- Xak 1",'%7C%7Canother%7C%7C-xak-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]);
}