function $RF(el, radioGroup) {
	if($(el).type == 'radio') {
		var el = $(el).form;
		var radioGroup = $(el).name;
	} else if ($(el).tagName.toLowerCase() != 'form') {
		return false;
	}
	return $F($(el).getInputs('radio', radioGroup).find(
		function(re) {return re.checked;}
	));
}
//You can pass it either a form (object or id) and a radio group name, or a radio button (object or id).
//var value = $RF('radio_btn_id');
//var value = $RF('form_id', 'radio_grp_name');