// jquery
  $('input:radio').click(function(){
    //alert(this.checked);
    //
    var $radio = $(this);
    // if this was previously checked
    if ($radio.data('waschecked') == true){
      $radio.prop('checked', false);
      $radio.data('waschecked', false);
    } else {
      $radio.prop('checked', true);
      $radio.data('waschecked', true);
    }
  });