Thread:Feedback/Ajax comments broken?

Ajax commenting seems to be broken (tested in Chrome and IE8). After pressing save, it shows the spinner but nothing else happens. It gives this error:

Webpage error details

User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; .NET CLR 3.0.04506.648; OfficeLiveConnector.1.3; OfficeLivePatch.0.0; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729) Timestamp: Mon, 19 Oct 2009 22:41:15 UTC

Message: Object doesn't support this property or method Line: 95 Char: 4 Code: 0 URI: http://liquidthreads.labs.wikimedia.org/w/extensions/LiquidThreads/lqt.js?urid=243z2