default.js error

Hi, I’m hoping I can get some help with this error I’m getting:
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Webpage error details

User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C)
Timestamp: Wed, 6 Oct 2010 23:34:24 UTC

Message: Object required
Line: 18
Char: 4
Code: 0
URI: http://yourlakenormandentist.com/wp-content/themes/herbmills/default.js
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