How to pass argument to index(arg='') ?

Hi,
It works well untill I change to new server.
I try to find out what i did wrong.
Here is the code

class Home extends MY_Controller {

/* this should load the index page */

// Dashboard

function __construct(){

parent::__construct();
}
public function index($team_id='')
{
....
}
}
before that I can access site by http://myweb.com/home.html or http://myweb.com/home/1.html
Now, I have to access only with index method http://myweb.com/home.html and http://myweb.com/home/index/1.html
How I can remove /index/
I wonder that why it works on my old server but after moving to cloud server it just does not work anymore.