function getObjReference(id) {
  if (document.all) {
    return document.all(id);
  } else {
    return document.getElementById(id);
  }

  return false;
}

function toggleLevel(id) {
  var oUL = getObjReference(id + '_c');
  var oLI = getObjReference(id);
  if (oUL == false || oLI == false) return;

  if (oUL.style.display == 'block') {
    oUL.style.display = 'none';
    oLI.style.backgroundImage = 'url(/_include/img/folder_closed.gif)';
  } else {
    oUL.style.display = 'block';
    oLI.style.backgroundImage = 'url(/_include/img/folder_open.gif)';
  }
}

var blIsLoaded = true;