[eluser]ozskry[/eluser]
[quote author="Holla die Waldfee" date="1211312403"]
Please write us ur solution, so anyone with the same problem will find its way...
[/quote]
An error in the javascript. I had [sortname: 'id'] in place of [sortname: 'id_ms_smurfs']. So, when I was accessing the json.php, the PHP script was working. But, inside the javascript, due to the wrong sortname, I had a query error. That's the reason you received "test".