function externalLinks()
{
  if (!document.getElementsByTagName)
    return;

  var anchors = document.getElementsByTagName("a");
  var areas = document.getElementsByTagName("area");

  for (var i = 0; i < anchors.length; i++)
  {
    var anchor = anchors.item(i);
    if (anchor.getAttribute("href") && anchor.getAttribute("rel") == "external")
      anchor.target = "_blank";
  }

  for (var i = 0; i < areas.length; i++)
  {
    var anchor = areas.item(i);
    if (anchor.getAttribute("href") && anchor.getAttribute("rel") == "external")
      anchor.target = "_blank";
  }
}

window.onLoadList.push(externalLinks);