XML Parsing not working in API version 2

The map at this link: http://www.julieshad.com/so_or_ag/agguide_map2_v2.html
is using this xml: http://julieshad.com/so_or_ag/marker.xml. It was
working a few days ago, and now it is not, with no changes to the
code. IE8 gives this error: 'Webpage error details

User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/
4.0; MSDigitalLocker; GTB6.5; .NET CLR 1.0.3705; eMusic DLM/3; .NET
CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)
Timestamp: Mon, 26 Jul 2010 18:24:30 UTC

Message: 'documentElement' is null or not an object
Line: 78
Char: 11
Code: 0
URI: http://www.julieshad.com/so_or_ag/agguide_map2_v2.html

"

So I'm not sure what's happening here, but its frustrating of course.
Any help would be greatly appreciated!

Thanks for your time,
Shad

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