redirect problem!!

[eluser]Unknown[/eluser]
hi , how can i redirect the page without change url
4 example url is smth like this
http://whilelearn.ir/admin/mng_post

when i click on a anchor tag which do some stuff and then redirect the page again to the mng_post , i used this function like this

Code:

$this->mng_post(); //they're in same controller

and this function too ,

Code:

redirect('admin/mng_post','refresh');

all above have same result and make my url smth like this ,

http://whilelearn.ir/admin/mng_post/delete_post/

how can i prevent it ??