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<VirtualHost 123.123.123.123>
        ServerName   gallery.yourdomain.org
        DocumentRoot /data/pictures/
        ErrorLog     logs/gallery-error_log
        TransferLog  logs/gallery-access_log
        PerlSetVar   GalleryTemplateDir '%%PREFIX%%/share/Apache-Gallery/templates'
        PerlSetVar   GalleryInfo 'Picture Taken => DateTimeOriginal, Flash => Flash' 
        PerlSetVar   GallerySizes '640 1024 1600 2272'
        PerlSetVar   GalleryThumbnailSize '100x75'
        PerlSetVar   GalleryCacheDir '/var/tmp/Apache-Gallery/'
        <Location />
                SetHandler        perl-script
                PerlHandler       Apache::Gallery
        </Location>
</VirtualHost>

And copy %%PREFIX%%/share/Apache-Gallery/css/gallery.css to your DocumentRoot

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