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