Hi Joe,
Thanks for answering my question, I really hadn't expected it!
I am really quite new into web development all all. Anyway, I discovered I was running IE8 and it has an inbuilt JavaScript debugger (like a mini-version of Visual Studio). Just press F12!
That way I can see that the xhHTTP.responseXML looks quite empty, e.g. the xml field is just an empty string and so on.
So you're right, the conclusion is: The code is fine - but the web site is gone.
OK, the code could have had some better error handling?
But wait...Then I wouldn't have bothered about trying to debug it and would still not know about the inbuilt debugger
Thanks again
Kjell