как через AJAX запрос получить только данные из функции, без HTML кода? - Разработка расширений для Joomla 1.5

 [ {"id":"4400","label":"Москва","value":"Москва"}, {"id":"5348","label":"Новомосковск","value":"Новомосковск"}, {"id":"9991","label":"Новомосковск","value":"Новомосковск"}, {"id":"278066","label":"Московский","value":"Московский"}] 

<?php defined( '_JEXEC' ) or die( 'Restricted access' ); ?>
<jdoc:include type="component" />

$sity = $model->getSity(); 
echo $sity; 
die();

[code=php]$query = "SELECT city_id, name FROM `jos_tlog_city` WHERE LCASE...............')";
        $db->setQuery( $query );[code=php]

 [{"id":"4400","label":"Москва","value":"Москва"},{"id":"5348","label":"Новомосковск","value":"Новомосковск"},{"id":"9991","label":"Новомосковск","value":"Новомосковск"},{"id":"278066","label":"Московский","value":"Московский"},]