How to replace index.php by any string ?

hi there ,

I have two application folders under the same system , one of them depends on index.php and application folder , and the other admin.php and administrator folder

I just want to replace index.php by ( home ) and admin.php by (admin)

not removing them as this will be confusing

how could this be done through .htaccess

thanks

nb : i am using the bad godaddy hosting

hay ? any help here ?