var chap_array = new Array(
["A Wolfs Warning 3",'a-wolfs-warning-3'],
["A Wolfs Warning 2",'a-wolfs-warning-2'],
["A Wolfs Warning 1",'a-wolfs-warning-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]);
}