var src = "http://triptracker.net/jsmap/images/badge/badge.html?mode=badge&feed=/trip/5558/georss&href=/trip/5558&title=Maidstone - Boxley: 090425";
function ttBadgeCode() {
  return "<iframe name='ttBadgeFrameName' scrolling='no' frameborder='0' allowTransparency='true' " +
         "src='" + src + "'" +         " style='width: 500px; height: 400px; border: none;" +
         "'></iframe>";
}
document.write(ttBadgeCode());