var regiondb = new Object()
regiondb["amalfi"] = [{value:"5", text:"5 Hours"},
                      {value:"8", text:"8 Hours"},
                      {value:"10", text:"10 Hours"}];
regiondb["vesuvio"] = [{value:"5", text:"5 Hours"},
                      {value:"8", text:"8 Hours"},
                      {value:"10", text:"10 Hours"}];

regiondb["pompei"] = [{value:"6", text:"6 Hours"},
                      {value:"8", text:"8 Hours"},
                      {value:"10", text:"10 Hours"},
                      {value:"12", text:"12 Hours"}];

regiondb["naples"] = [{value:"6", text:"6 Hours"},
                      {value:"8", text:"8 Hours"},
                      {value:"10", text:"10 Hours"},
                      {value:"12", text:"12 Hours"}];

regiondb["caserta"] = [{value:"6", text:"6 Hours"},
                      {value:"8", text:"8 Hours"},
                      {value:"10", text:"10 Hours"},
                      {value:"12", text:"12 Hours"}];


function setHours(chooser) {
    var newElem;
    var where = (navigator.appName == "Microsoft Internet Explorer") ? -1 : null;
    var cityChooser = chooser.form.elements["hours"];
    while (cityChooser.options.length) {
        cityChooser.remove(0);
    }
    var choice = chooser.options[chooser.selectedIndex].value;
    var db = regiondb[choice];
    newElem = document.createElement("option");
    newElem.text = "Choose Excursion duration";
    newElem.value = "";
    cityChooser.add(newElem, where);
    if (choice != "") {
        for (var i = 0; i < db.length; i++) {
            newElem = document.createElement("option");
            newElem.text = db[i].text;
            newElem.value = db[i].value;
            cityChooser.add(newElem, where);        }
    }
}