window.onload = function() {

  andThen(function() {
    $("iFrame").src = "sumGet.phtml?figure1=5&figure2=1";
  });

  andThen(function() {
    var iFrameBody = extractIFrameBody($("iFrame"));
    iFrameBody.innerHTML =
       "<form action='sumPostForm.phtml' method='POST'>" +
         "<input type='text' name='figure1' value='5'>" +
         "<input type='text' name='figure2' value='2'>" +
       "</form>";
    var form = iFrameBody.firstChild;
    form.submit();
  });

}

function onIFrameLoad() {
  var serverResponse = extractIFrameBody($("iFrame")).innerHTML;
  $("response").innerHTML = serverResponse;
}