<IfModule mod_rewrite.c>
	RewriteEngine On 
	RewriteBase /admin/

	RewriteCond %{REQUEST_FILENAME} !-d 
	RewriteRule ^controllers/(.*)$ index.php?url=$1 [L,QSA]
	RewriteRule ^libraries/(.*)$ index.php?url=$1 [L,QSA]
	RewriteRule ^models/(.*)$ index.php?url=$1 [L,QSA]

	RewriteCond %{REQUEST_FILENAME} !-d 
	RewriteCond %{REQUEST_FILENAME} !-f 
	RewriteCond %{REQUEST_FILENAME} !-l 

	RewriteRule ^(.+)$ index.php?url=$1 [QSA,L]
</IfModule>

Options -indexes