/**
 * Returns the value of the selected radio button in the radio group
 * 
 * form: the form that the radio group is part of 
 * radioGroup: the name of the radio group 
 */
function $RF(form, radioGroup) {
	chk_button = $(form).getInputs('radio', radioGroup).find(function (button){
		if (button.checked){
			return true;	
		} 
	});
	if (chk_button){
		//alert (chk_button.value);
		return chk_button.value;
	} else {
		//alert ('none');
		return false;
	}
}