Remove class name from url

[eluser]Suhas nazir[/eluser]
Hai All

I am trying to change the name of controller name from url its working but take a look at the below problem

i change the route as
$route['function_name/:any']='mycontroller/function_name';
Suppose if there is a parameter like this mycontroller/function_name/12';
the value 12 is not get in the function ...
How i rewrite the route to make it possible
Thanks in advance;