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