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

    return
  }
  anchors = document.getElementsByTagName('a')
  for (i = 0; i < anchors.length; i++) {
    anchor = anchors[i]
    if (anchor.getAttribute("href") && anchor.getAttribute("rel") == "external") {
      anchor.target = "_blank"
    }
  }

}