<files file-name>
order allow,deny
deny from all
</files>

RewriteEngine On
# index PAGE slash final
RewriteRule ^(.*)/$ index.php?p=$1 [L]
# index PAGE dot exten
RewriteRule ^(.*).html$ index.php?p=$1 [L]
RewriteRule ^(.*).htm$ index.php?p=$1 [L]

ErrorDocument 400 /index.php?p=400
ErrorDocument 401 /index.php?p=401
ErrorDocument 403 /index.php?p=403
ErrorDocument 404 /index.php?p=404
ErrorDocument 500 /index.php?p=500
ErrorDocument 503 /index.php?p=503