<ifModule mod_rewrite.c>
RewriteEngine on
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f

</ifModule>

RewriteEngine on 
RewriteRule ^(.*)\.html $1\.php 

RewriteRule ^index(|/)$ index.php
RewriteRule ^index/p/(..*)$ index.php?p=$1