function PollExAnswersValidation(sender, e) {
    var poll = sender.parentNode.parentNode;
    var inputElements = poll.getElementsByTagName('input');
    for (var i = 0; i < inputElements.length; i++) {
        if ((inputElements[i].type == 'checkbox' || inputElements[i].type == 'radio') && inputElements[i].checked) {
            e.IsValid = true;
            return;
        }
    }
    e.IsValid = false;
}