function checkRadios(name) {
    var el = document.getElementsByName(name);
    for(var i = 0 ; i < el.length ; ++i) {
	if(el[i].type == "radio") {
	    if(el[i].checked) {
		itemchecked = true;
		return true;
	    }	    
	}
    }
    return false;
}
function submitPoll(question_id) {
    if (checkRadios('vote_radio_' + question_id)) document.getElementById('pull').submit();
    else alert("Выберите вариант ответа");
}