I just posted a new message to this forum and found the alert sign in the IE. Here are the details.

Webpage error details

User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; GTB6.6; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; WWTClient2; InfoPath.2; .NET CLR 1.1.4322; .NET4.0C; .NET4.0E; OfficeLiveConnector.1.5; OfficeLivePatch.1.3; dazzMediaServer 1.4)
Timestamp: Mon, 7 Mar 2011 00:27:47 UTC

Message: Object expected
Line: 1
Char: 1
Code: 0
http://forum.yetanotherforum.net/sites/forum/Themes/yafpro/yafpro.js 

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