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") == "esterno") {
		if (anchor.title) anchor.title += " (Sito esterno)";
		if (!anchor.title) anchor.title = "Sito esterno";
	} 
} 
} 
window.onload = externalLinks;