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stargeek - 7:50 am on Mar 8, 2005 (gmt 0)
you could check for referrer and if it matches a hijacking page you could display a different page or nothing at all, but this could be interpreted as cloaking.
in response to IP based protection. the ip of the website is not the ip you'd be worried about, it would be google's spider IP and delivering different content to them is a no-no.