RewriteEngine On
Options -Indexes
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^([^/.]+)/?$ ?act=$1
RewriteRule ^([^/]+)\.html$ ?act=$1
RewriteRule ^([^/.]+)/([^/]+)\.html$ ?act=$1&sub=$2
RewriteRule ^index\.(htm|html|php) / [R=301,L]