Fotiman - 5:19 pm on Feb 8, 2013 (gmt 0)

When you say you "got nothing", does that mean you didn't even see an alert dialog? If so, that would suggest that your success handler was never reached.

I assume that the msg contains an XML document, which contains 1 or more <response> elements. Perhaps you could do something like:

$('body').append("<textarea id='debugOutput' rows='10' cols='30'><\/textarea>");
$('#debugOutput').val(msg);