Ajax sample not working on IE9 on AJAX website IE9, Win 7

I am using this AJAX sample on my production website:

It has worked for 2 years and now IE9 is out and it will not work on Windows 7 IE9.   Can someone offer any insight?
Who is Participating?
John ClaesConnect With a Mentor Senior .Net Consultant & Technical AnalistCommented:
I'm afraid it looks like it is a real issue with IE 9

you can enforce IE8 emulation using the compatability meta tag.
<meta http-equiv="X-UA-Compatible" content="IE=EmulateIE8">

or you can enforce users to use the compatibility mode
see for further info and code :
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