var imageref = '/external.png';

/* decorate all external links */
var hrefs = document.getElementsByTagName('a');
for (var i = 0; i < hrefs.length; i++) {
   if (hrefs[i].href.match(/^http:\/\//) && !hrefs[i].href.match(/paulamelton\.com/)) {
      var link = hrefs[i];
      var parent = link.parentNode;
      var image = document.createElement('img');
      image.src = imageref;
      image.alt = 'external link';
      image.style.marginLeft = '2px';
      if (link === parent.lastChild) {
         parent.appendChild(image);
      } else {
         parent.insertBefore(image, link.nextSibling);
      }
   }
}