looks like an IE javascript error. I'm guessing cause by an ad.
http://support.microsoft.com/kb/927917
here are some workarounds which don't seem ideal:
http://support.microsoft.com/kb/927917#more_information
I'll see if I can track down the ad, but it might be difficult.
arn
Arn,
I'm getting the same messages without the ads (I'm a demi) so I'm not sure it's caused by them unless they are still loading, just not showing up for us.