mod_rewrite transfers a client number

into an access_log entry

[maggi]

I allow visitors to download images when they register.
They can call with their given ClientId:
mydomain.com/imag_123_abc_ClientId

mod_rewrite is rewriting to mydomain/path/cgi?image=123&templ=abc

In addition I want mod_rewrite to rewrite the ClientId into a Referrer in order to get an entry in access_log.

Thanks for some hints, Maggi