www.mydomain.com/subDir/index.cgi?rm=foo
- or - 
www.mydomain.com/subDir/index.cgi?rm=bar

##</code><code>##

www.mydomain.com/subDir/foo
www.mydomain.com/subDir/bar

##</code><code>##

RewriteEngine On
                                                                                                                                                                   
RewriteCond     %{REQUEST_URI}  sale
RewriteRule ^(.*)       index.cgi?rm=$1 [L]
RewriteRule ^(.*)\/     index.cgi?rm=$1 [L]