code: function error(code, stop) {
  	var msg = 'Highcharts error #' + code + ': www.highcharts.com/errors/' + code;
  	if (stop) {
  		throw msg;
  	} else if (win.console) {
  		console.log(msg);
  	}
  }
docs: Provide error messages for debugging, with links to online explanation