function tour_traveler_openCity(evt, cityName) {
    var tour_traveler_i, tour_traveler_tabcontent, tour_traveler_tablinks;
    tour_traveler_tabcontent = document.getElementsByClassName("tabcontent");
    for (tour_traveler_i = 0; tour_traveler_i < tour_traveler_tabcontent.length; tour_traveler_i++) {
        tour_traveler_tabcontent[tour_traveler_i].style.display = "none";
    }
    tour_traveler_tablinks = document.getElementsByClassName("tablinks");
    for (tour_traveler_i = 0; tour_traveler_i < tour_traveler_tablinks.length; tour_traveler_i++) {
        tour_traveler_tablinks[tour_traveler_i].className = tour_traveler_tablinks[tour_traveler_i].className.replace(" active", "");
    }
    document.getElementById(cityName).style.display = "block";
    evt.currentTarget.className += " active";
}