function setOptions(chosen) {
var selbox = document.myform.opttwo;
 
selbox.options.length = 0;
if (chosen == "0") {
  selbox.options[selbox.options.length] = new Option('Subcategory','0');
 
}
if (chosen == "1") {
// voicing_id
  selbox.options[selbox.options.length] = new Option('SATB','8');
  selbox.options[selbox.options.length] = new Option('SSATB','26');
  selbox.options[selbox.options.length] = new Option('SSA','22');
  selbox.options[selbox.options.length] = new Option('SAT','25');
  selbox.options[selbox.options.length] = new Option('SAB','9');
  selbox.options[selbox.options.length] = new Option('SA','21');
  selbox.options[selbox.options.length] = new Option('ST','24');
  selbox.options[selbox.options.length] = new Option('SB','23');
  selbox.options[selbox.options.length] = new Option('TB','28');
  selbox.options[selbox.options.length] = new Option('TTBB','27');
  selbox.options[selbox.options.length] = new Option('Solo','10');
  selbox.options[selbox.options.length] = new Option('Duet','14');
  selbox.options[selbox.options.length] = new Option('Two Part Choral','20');
  selbox.options[selbox.options.length] = new Option('Trio','18');
  selbox.options[selbox.options.length] = new Option('Quartet','30');
  selbox.options[selbox.options.length] = new Option('Mixed Quartet','32');
  selbox.options[selbox.options.length] = new Option('Octet','31');
  selbox.options[selbox.options.length] = new Option('Ensemble','12');
  selbox.options[selbox.options.length] = new Option('Obligato','39');
  selbox.options[selbox.options.length] = new Option('A Capella','19');
  selbox.options[selbox.options.length] = new Option('Descant','38');
  selbox.options[selbox.options.length] = new Option('Children\'s Choir','11');
  selbox.options[selbox.options.length] = new Option('Youth Choir','34');
}
if (chosen == "2") {
// voicing_id
  selbox.options[selbox.options.length] = new Option('Orchestration','37');
  selbox.options[selbox.options.length] = new Option('Organ','35');
  selbox.options[selbox.options.length] = new Option('Handbells','36');
}
if (chosen == "3") {
// tempo_id
  selbox.options[selbox.options.length] = new Option('Slow','1');
  selbox.options[selbox.options.length] = new Option('Moderate','2');
  selbox.options[selbox.options.length] = new Option('Fast','3');
}
if (chosen > 3) {
  selbox.options[selbox.options.length] = new Option('Enter keywords -->','0');
}
}