URL rewriting using htaccess

[eluser]shankar ganesh[/eluser]
In controller folder i am having two folders named as User and admin, one for user and another for admin
I can able to access user panel by http://wwa.jumpwebservice.com/ARG/
and for admin panel http://wwa.jumpwebservice.com/ARG/index.php/admin/home

where "admin" is folder name and "home" is controller name and how to customize URL like
http://wwa.jumpwebservice.com/ARG/admin

and also if URL is like http://wwa.jumpwebservice.com/ARG/index.php/admin/about
it should be rewrite as http://wwa.jumpwebservice.com/ARG/admin/about

and in router.php i initiliazed as

Code:

$route[‘default_controller’] = “user/home”;

where "user" is folder name and "home" is controller name. Any possible for adding another default controller for admin like

Code:

$route[‘default_controller’] = “admin/home”;