mod_rewrite for multiple applications

[eluser]obay[/eluser]
CI says to put the following code in .htaccess to remove "index.php" from the URL

Code:

RewriteEngine On
RewriteCond $1 !^(index\.php|images|robots\.txt)
RewriteRule ^(.*)$ /index.php/$1 [L]

However, I have two applications sharing one CI installation. I renamed their index.php's to

Code:

admin.php

and

Code:

public.php

How do I modify the rewrite code for .htaccess? I've googled and searched the forums but none seems similar to my situation. Any help appreciated

EDIT:
I access my pages like "OLD" below, when I want it to be like "NEW" below:

OLD: http://localhost/mysite/admin.php/story/edit/25
NEW: http://localhost/mysite/admin/story/edit/25

and

OLD: http://localhost/mysite/public.php/news/story/25/title-of-article
NEW: http://localhost/mysite/public/news/stor...of-article