function votes_check(form)
{
    var count = form.vote_nr.length;
    var checked = false;
    
    if (count > 0)
    {
        for (i=0; i<count; ++i)
        {
            if (form.vote_nr[i].checked) checked = true;
        }
    }
    
    if (!checked){
        alert('Jūs nepasirinkote nė vieno atsakymo varianto...');
        return false;
    }
    
    return checked;
}