function getCheckedValue(radioObj) {
	if(!radioObj)
		return null;
	var radioLength = radioObj.length;
	if(radioLength == undefined)
		if(radioObj.checked)
			return radioObj.value;
		else
			return null;
	for(var i = 0; i < radioLength; i++) {
		if(radioObj[i].checked) {
			return radioObj[i].value;
		}
	}
	return null;
}

function poll_stem( poll_id )
{
  var antwoord_id = getCheckedValue( $( 'form_poll_'+ poll_id ).antwoord );
  
  if( poll_id > 0 && antwoord_id > 0 )  
  { 
    new Ajax.Updater( 
      'poll_'+poll_id, 
      '/poll/stem.html', 
      {method:'post',parameters:'poll_id='+poll_id+'&antwoord_id='+antwoord_id}
    );
    $('poll_submit_'+poll_id).disabled = true;
  }
}