var query = location.href;

if(query.indexOf('?') == -1) {

	query = "ID=" + escape("http://" + location.host + location.pathname);

} else {

	query = query.substring((query.indexOf('?')) + 1) + "&ID=" + escape("http://" + location.host + location.pathname);

}

document.writeln('<s'+'cript type="text/javascript" src="http://www.altervista.org/servizi/guestbook/guestbook_js.php?' + query + ' "></s'+'cript>');