tricks for revision control for customization of an external source

I have ./htdocs define as an svn:external....all is well, but I am
overriding logo.gif and would like to commit this into my local
repository somehow, as I do not have access to the external
repository, nor would it make sense to check in if I did.

Short of leaving it as a locally modified file, are there any other
ways to override the one or two files where this is necessary?

Mainly, logo.gif and config.php are customized for each instance of
"TheApp" that I pull from an external repository.

-- 
Anthony Ettinger
408-656-2473
http://anthony.ettinger.name
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