hidding url with .htaccess

[eluser]Mitja B.[/eluser]
My .htaccess

Code:

RewriteEngine On
    RewriteBase /
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteCond $1 !^(index\.php|public|tmp|robots\.txt)
    RewriteRule ^(.*)$ index.php?/$1 [L]

I have controller main.php so my url is domain/main/function

how can i with .htaccess hide main from url that my url will be just domain/function


Thx