var chap_array = new Array(
["Absorb; Ability 2",'absorb%3B-ability-2'],
["Absorb; Ability 1",'absorb%3B-ability-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]);
}