// JavaScript Document
//        note that all 'getElementById' values MUST really exist in calling html
function ShowReg(op) {
  document.getElementById('AP110209').style.display='none';
  document.getElementById('AP111609').style.display='none';
  document.getElementById('AP120709').style.display='none';
  document.getElementById('APN120709').style.display='none';

  if (op == 1) {
    document.getElementById('AP110209').style.display="block";
  }
  if (op == 2) {
    document.getElementById('AP111609').style.display="block";
  }
  if (op == 3) {
    document.getElementById('AP120709').style.display="block";
  }
  if (op == 4) {
    document.getElementById('APN120709').style.display="block";
  }
}