function collapseElem(obj) {
  var el = document.getElementById(obj);
  el.style.display = 'none';
}
function expandElem(obj) {
  var el = document.getElementById(obj);
  el.style.display = '';
}
function collapseAll() {
  var numFormPages = 2;
  for(i=2; i <= numFormPages; i++) {
    currPageId = ('mainForm_' + i);
    collapseElem(currPageId);
  }
}