# Rewrite document-root to /sub/ according to the provided sub.domain.tld
  RewriteCond %{HTTP_HOST} ^(.*)((\.[a-z0-9-]+){2}) [NC]
  RewriteCond %{REQUEST_URI} !^/cgi-bin/
  RewriteCond %{REQUEST_URI} !^/icons/
  RewriteRule (.*) %{DOCUMENT_ROOT}%1$1  [L]