TOPIC:

1;Select Country;none
0;USA;usa
0;Germany;germany

function ff_country_action(element, action)
{
    var city = ff_getElementByName('city');

    var usaArray = new Array(
        'New York', 'Los Angeles', 'Chicago', 'Houston', 'Phoenix', 'Philadelphia',
        'San Antonio', 'San Diego', 'Dallas', 'San Jose', 'Austin', 'Denver',
        'Las Vegas', 'Seattle', 'Miami', 'Washington', 'Sacramento', 'Other'
    );
    var germanyArray = new Array(
        'Berlin', 'Frankfurt', 'München', 'Köln', 'Frankfurt am Main', 'Stuttgart',
        'Düsseldorf', 'Dortmund', 'Essen', 'Leipzig', 'Bremen', 'Other'
    );
    if (element.value == 'none') {
        // drop cities
        while (city.options.length > 0)
            city.options[city.options.length-1] = null;
    } else {
        // get the matching array
        var selectedArray = eval(element.value+'Array');

        // drop supernumerous option
        while (selectedArray.length < city.options.length-1)
            city.options[city.options.length-1] = null;

        // add the new options
        city.options[0] = new Option('Select City', 'none', true, true);
        for (var i=0; i < selectedArray.length; i++)
            city.options[i+1] =
                new Option(selectedArray[i], selectedArray[i]);
    }
}