Kevin

<VirtualHost *:80>
    ServerAdmin podcast@chrysalis.com
    DocumentRoot /data/www/chrysalis/audioagain/www/
    ServerName audio-again.com
    ServerAlias *.audio-again.com audio-again.co.uk *.audio-again.co.uk *.audioagain.co.uk audioagain.co.uk *.audioagain.com audioagain.com
    ErrorLog /data/logs/audioagain-error_log
    CustomLog /data/logs/audioagain-access_log common
    RewriteEngine on

    RewriteMap lowercase int:tolower

    # check the hostname is right so that the RewriteRule works
    RewriteCond ${lowercase:%{SERVER_NAME}} ^[a-z-]+\.audio[-]?again\.co[m|(\.uk)]$

    # concatenate the virtual host name onto the start of the URI
    # the [C] means do the next rewrite on the result of this one
    RewriteRule ^(.+) ${lowercase:%{SERVER_NAME}}$1 [C]

    # now create the real file name
    RewriteRule ^([a-z-]+)\.audio[-]?again\.co[m|(\.uk)]/(.*) /data/www/chrysalis/audioagain/$1/$2

    ErrorDocument 404 ../index.php
</VirtualHost>