window.onload=externalLinks;

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.onclick   = function( ) { window.open( this.href ); return false; }
        anchor.onkeypress= function(e) { k = (e) ? e.keyCode : window.event.keyCode; if (k==13) window.open(this.href); return false; }
    }
  }
}