function ajax_update_user_data(field_name, field_value)
{
    (function($) {
        
        var input_element = "#myaccount_" + field_name;
        var status_element = input_element + "_status";
        
        $.post(
            "/", 
            {
                "action": "ajax_update_user_data",
                "field_name": field_name,
                "field_value": field_value 
            },
            function (data)
            {
                if (data.succeeded)
                {
                    $(input_element).val(data.value);
                }
                
                $(status_element).html(data.status);
                $(status_element).fadeIn("slow");
            },
            "json");
            
    })(jQuery)
}