Apache's mod_rewrite is very powerful and can be used to redirect selected traffic.
http://httpd.apache.org/docs/2.2/misc/rewriteguide.html
http://httpd.apache.org/docs/2.2/mod/mod_rewrite.html
You can use the server environment variables or mod_authz to make sure that the visitors at least go to the trouble of forging the referrer header.
http://httpd.apache.org/docs/2.2/env.html
http://httpd.apache.org/docs/2.2/mod...uthz_host.html
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