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   1  function externalLinks() { 
   2   if (!document.getElementsByTagName) return; 
   3   var anchors = document.getElementsByTagName("a"); 
   4   for (var i=0; i<anchors.length; i++) { 
   5    var anchor = anchors[i]; 
   6    if (anchor.getAttribute("href") && anchor.getAttribute("rel") == "external") 
   7     anchor.target = "_blank"; 
   8    } 
   9  }