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Why "bye (1)"; in the answer of XmlHttpRequest?

Possible duplicate:
Why does Google add while (1); to their JSON answers?

I play firebug with google calendar. I found that some kind of XHR request has a response as shown below:

while(1);[['us','bW9yZ2FuLmNoZW5nbW9AZ21haWwuY29t 20090320/20090904 63378122163']]

It looks like JSON with a jQuery statement prefix.

I'm not sure why there is such an XHR answer on Google Calendar. Is there any known AJAX practice about this?

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json javascript ajax
May 16 '09 at 2:05 a.m.
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