Just tried in IE8 and I get the error too.
Nothing you can do about it and as it doesn't seem to effect the working of the page I'd ignore it. Hopefully the ED will spot this as it's only them that can do anything about it.
For info, if the ED does spot this I'm getting the errors
Webpage error details
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 3.0.4506.2152; .NET CLR 3.5.30729; .NET4.0C)
Timestamp: Wed, 9 Feb 2011 10:17:22 UTC
Message: Invalid character
Line: 1
Char: 7
Code: 0
URI:
http://googleads.g.do...pagead/test_domain.js
Message: Syntax error
Line: 10
Char: 23
Code: 0
URI:
http://www.theanswerb.../ukngbi.php?adtype=66
Message: Syntax error
Line: 10
Char: 23
Code: 0
URI:
http://www.theanswerb.../ukngbi.php?adtype=66