When we did something similar to what (I think) you are trying to do, we did it in the following way:

• Use a seperate Apache.conf file for each site.
• Define a variable of the same name in each .conf file
• Knock up a config.pl file that checks the define and sets default colours etc depending on the site referred to
• Start each CGI file with a do(config.pl); line
• Refer to these default variables.

With this setup we got three functionally similar sites running off the same cgi-bin directory, which is what I think you are looking to do.

$japh->{'Caillte'} = $me;