Routes Pass

I am having some problems trying to pass a variable in my routes.

 

I have my standard index($type = null) function for pagination.

 

I want to pass "open" or "closed" as the $type so the user can view all open cases or closed cases if they wish. The $type variable just gets passed inside the function to determine which records to pull or all if null

 

so the url would be

tickets/ or

tickets/open or

tickets/closed

 

Any ideas?

 

Thanks

 

Dave