> http://intranat/html/. Iwish to have the format:
http://Internet1/html
> resp. http://Internet2/html.

I believe that you want:

ReplaceRules remove http://intranat

That will strip the supplied string, have a look at the SWISH-E manual
for further information on ReplaceRules.  If you strip the authority
(http://servername) from the URL then you will have a relative URL
which will work on any server.

--
,David Norris
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