$(function() {
    $(".tour-city-selector").change(function() {
        var city = $(this).val();
        var city$ = $("#tour-city-selector");
        var curcity$ = $(".current-city", city$);
        curcity$.removeClass("current-city");
        curcity$.hide();
        curcity$ = $("li[city='"+city+"']", city$);
        curcity$.addClass("current-city");
        curcity$.show();
    })
})