function setType(chosen) {
var selbox = document.registerForm.cost;
 
selbox.options.length = 0;

if (chosen == '114') {
  selbox.options[selbox.options.length] = new Option('$40 – single person');
  selbox.options[selbox.options.length - 1].value = '244';
  selbox.options[selbox.options.length] = new Option('$70 – couple');
  selbox.options[selbox.options.length - 1].value = '245';
  selbox.disabled = false; 
}
if (chosen == '109') {
  selbox.options[selbox.options.length] = new Option('$40 – Full O Week program (includes meals throughout the week - inc Wed Dinner)');
  selbox.options[selbox.options.length - 1].value = '231';
  selbox.options[selbox.options.length] = new Option('$15 – Wednesday Night Dinner only');
  selbox.options[selbox.options.length - 1].value = '232';
  selbox.disabled = false; 
}
if (chosen == '115') {
  selbox.options[selbox.options.length] = new Option('$40 – singles');
  selbox.options[selbox.options.length - 1].value = '247';
  selbox.options[selbox.options.length] = new Option('$70 – couples');
  selbox.options[selbox.options.length - 1].value = '248';
  selbox.disabled = false; 
}
if (chosen == '112') {
  selbox.options[selbox.options.length] = new Option('$40 – single');
  selbox.options[selbox.options.length - 1].value = '235';
  selbox.options[selbox.options.length] = new Option('$60 – couple');
  selbox.options[selbox.options.length - 1].value = '236';
  selbox.options[selbox.options.length] = new Option('$10 – single day attendance');
  selbox.options[selbox.options.length - 1].value = '237';
  selbox.disabled = false; 
}
if (chosen == '113') {
  selbox.options[selbox.options.length] = new Option('$50 – Workers');
  selbox.options[selbox.options.length - 1].value = '241';
  selbox.options[selbox.options.length] = new Option('$25 – Students');
  selbox.options[selbox.options.length - 1].value = '242';
  selbox.disabled = false; 
}
}