function initExternalLinks() {
	
	/* ---- rel esterno ---- */
	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") {
			anchor.target = "_blank";
			if (anchor.title) anchor.title += " (Link Esterno)";
			if (!anchor.title) anchor.title = "Link Esterno";
		} 
	}
	
}

Event.observe(window, 'load', initExternalLinks );