$(document).ready(function() {

    $(".country").change(function() {

        var data = "country=" + $(".country").val();

        $.ajax({
            type: "GET",
            url: "/tools/RegionServices.ashx",
            data: data,
            dataType: 'json',
            success: function(msg) {

                var control = document.getElementById('ctl00_Left_SearchControl1_ddlRegion');

                $('.region').empty();

                for (var i = 0; i < msg.length; i++) {

                    control.options[i] = new Option(msg[i].Name, msg[i].Value);
                }
            }
        });

    });

});