function linksExternal()
{
 if(document.getElementsByTagName)
 {
  var anchors = document.getElementsByTagName("a");
  for (var i=0; i<anchors.length; i++)
  {
   var anchor = anchors[i];
   if (anchor.getAttribute("rel") == "external")
   {
    anchor.target = "_blank";
   }
  }
 }
}

function start()
{
 linksExternal();
}