Post Publishing Script Error

Using 2.7, Theme Called “Sea,” IE 8.0 Beta, XP Professional SP 4.

I am receiving the following error when trying to use the Publishing options in the Post menu. For example, trying to schedule a post for a time in the future or changing visibility or status.

Webpage Script Errors

User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; .NET CLR 3.0.04506.648)
Timestamp: Wed, 17 Dec 2008 15:25:24 UTC

Message: Object doesn’t support this property or method
Line: 131
Char: 2
Code: 0
URI: http://www.brianmcdaniel.org/wp-admin/js/post.js?ver=20081210

I don’t receive the error when using these functions to edit a Page.