var chap_array = new Array(
["3X3 Eyes (Sazan Eyes) 2",'3x3-eyes-%28sazan-eyes%29-2']);

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]);
}