//funzione che apre i link con rel="external" in una popup javascript
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.title     = "the link opens a new window" ;
        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; }
    }
  }
}