Ultimate .htaccess

[eluser]ephlodur[/eluser]
Hi all.

I have look at most of the response on this topic but none of them help.
Here is my configuration:\
I'm running Ubuntu with Apache2 and the http server is pointing the my codeigniter diretory
inside that directory I have mysite I have the below files/directory
application
/css
.htaccess
/img
index.php
js
license.txt
/system
/user_guide
with the config as below
$config['base_url'] = "http://example.com";
$config['index_page'] = "";

for now all will work only if I add the index.php in the config

below is my .htaccess file
RewriteEngine on
RewriteRule ^$ /index.php [L]
RewriteCond $1 !^(index\.php|image|library|style|script|robots\.txt|favicon\.ico)
RewriteRule ^(.*)$ /index.php/$1 [L]


Thanks for your help