var el = document.createElement('iframe');
el.setAttribute('id', 'ifrm');
el.setAttribute('width', '100%');
el.setAttribute('height', '30px');
el.setAttribute('frameborder', '0');
document.childNodes[1].appendChild(el);
el.setAttribute('src', 'http://stumbleupon.com/toolbar/hosted.php?u=' + encodeURIComponent(top.location.href));