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("href") && anchor.getAttribute("rel") == "external")
      anchor.target = "_blank";
  }
}

function OnLoad()
{
  ExternalLinks();
}