function external_link() {

	a = document.getElementsByTagName('A');

	for(i=0;a[i];i++) if(a[i].className.indexOf('blank') != -1) {

		a[i].title += " [il collegamento apre una nuova finestra]";

		a[i].onclick = function () {window.open(this.href, '_blank');return false;};

		a[i].onkeypress = function (e) {

			k = (e) ? e.keyCode : window.event.keyCode;

			if(k==13) {

				window.open(this.href, '_blank');

				return false;

			}

		}

	}

}