RewriteEngine on
RewriteCond %{HTTP_HOST} !^www\.
RewriteRule ^(.*)$ http://www.%{HTTP_HOST}/$1 [R=301,L]
RewriteRule \.(css|jpe?g|gif|png)$ - [L]
RewriteCond %{REQUEST_URI} ^/[^\.]+[^/]$
RewriteRule ^(.*)$ http://%{HTTP_HOST}/$1/ [R=301,L]

RewriteRule ^link/([^/\.]+)/?$ /link/index.php?id=$1 [L]
RewriteRule ^kb/?$ /kb_files/index.php [L]
RewriteRule ^kb/([^/\.]+)/?$ /kb_files/index.php?section=$1 [L]
RewriteRule ^kb/([^/\.]+)/([^/\.]+)/?$ /kb_files/index.php?section=$1&article=$2 [L]

Redirect /iPhone/ /iphone/

RewriteRule ^/?$ pages/index.php [L]
RewriteRule ^([^/\.]+)/?$ /pages/$1.php [L]
RewriteRule ^([^/\.]+)/([^/\.]+)/?$ /pages/$1_$2.php [L]
RewriteRule ^([^/\.]+)/([^/\.]+)/([^/\.]+)/?$ /pages/$1_$2_$3.php [L]
RewriteRule ^([^/\.]+)/([^/\.]+)/([^/\.]+)/([^/\.]+)/?$ /pages/$1_$2_$3_$4.php [L]