[jQuery] Handling timeouts with jsonp ajax requests

[jQuery] Handling timeouts with jsonp ajax requests

Hi,
How jQuery handles timeouts on jsonp requests ? Does it call the error callback ? something else ?
Basically a request like this one...
[....]
$.ajax({'url' : url, 'data' : params, dataType : 'jsonp', timeout: 2500, success : callback, error : callback});
<br clear="all">[....]
... does not seem to call the error callback when during more than 2.5 sec
Any help would be welcome :-)
thanks
--
Matthias ETIENNE