Google bot problem

I have two websites with different content one written in native language and other one is in english for international users. 15% of international users somehow manage to enter native website and on international site vice versa.

I use .NET IP Location service to locate where is user came from and then redirect him to correct website in case he got there wrong. Problem is that Google bots from all around the world can be any country and have different IP's... So how i distinguish between those and real u开发者_JAVA百科sers so i can keep bots on my site while to redirect wrong type of users to right type of website?

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Exclude the bots from redirection:

http://www.google.com/support/webmasters/bin/answer.py?answer=80553

You could also ignore those by identifying their User-Agent.