CI: Parameters and Folders

[eluser]Roosevelt![/eluser]
Hello,
The title is lame, just pay attention to the body of the message :p.

I have a controller file called jack.php and it is located in this path:

/system/application/controllers/admin/jack.php

In the controller I have a method called test(). And it takes one parameter.

Now if I call http://web/admin/jack/1, where 1 is the parameter. CI doesn't read that value and returns a 404 error.

How do I fix this?

Thanks a bunch in advance.