fetching XML data when I realized, after testing in other browsers, that Opera was the only browser in which the code worked. Investigation revealed that the proxy request for the XML data was not setting the Content-type header appropriately to designate the content as XML. Despite this fact, Opera loaded the XML data. Neither IE nor Firefox would load the data at all. Hmm, not sure if this could be classified as a bug or a feature for the ol' Opera Browser.