Can't use Upload / insert buttons with P2 1.2.3

I am gettings an error when trying to edit a post (post.php). See error below. This prevents me from using the upload / insert button options.

I am running wp 3.1.1, and P2 1.2.3

Any suggestions?

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 1.1.4322; eMusic DLM/4; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; AskTbFXTV5/5.9.1.14019)
Timestamp: Mon, 18 Apr 2011 10:31:16 UTC

Message: Object doesn’t support this property or method
Line: 155
Char: 9407
Code: 0
URI: http://hearmoretunes.com/wp-admin/load-scripts.php?c=0&load=hoverIntent,common,jquery-color,schedule,wp-ajax-response,autosave,wp-lists,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-resizable,jquery-query,admin-comments,suggest,jquery-ui-sortable,postbox,post,word-count,thickbox,media-upload&ver=c1c854f5d9062306d43d7331055686c9