$(document).ready(function(){
    $("div.supportCountryBox").css("display","none");
    $("div.supportCountryBox:first").css("display","block");
    $("select[name='supportCountries']").change(function() {
            $("#CountryList > *").hide();
            var str='#' + $("select[name='supportCountries'] option:selected").val();
            $(str).show("fast");
    });
});