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