<!-- 
function handleError (err, url, line) {
    if (err.indexOf('is not defined') != -1) {
      alert('Oops, something is not defined.\n' +
             err + '\n' + url + '\nline no: ' + line);
      return true; // error is handled
    }
    else
      return false; // let the browser handle the error
  }
  window.onerror = handleError;
 //-->