makeFeedburnerFormStrictValid();

function makeFeedburnerFormStrictValid() {
  document.getElementById('feedmail').target = "popupwindow";
  document.getElementById('feedmail').onsubmit = "window.open('http://www.feedburner.com/fb/a/emailverifySubmit?feedId=2743080', 'popupwindow', 'scrollbars=yes,width=550,height=520'); return true"; 
}

function onSubmitFeedburnerForm() {
  window.open('http://www.feedburner.com/fb/a/emailverifySubmit?feedId=2743080', 'popupwindow', 'scrollbars=yes,width=550,height=520');
  return true;
}

// Author: Alexey Novikov, originally made for my Micromarketing Blog
// http://blog.micromarketing.ru