static urls for dynamic conent (routing question)


I wanna provide static urls for my users, and I figured out that I can
do it with the following:

map.user ':username', :controller => 'users', :action => 'show'

however, I also have the following in my routes.rb, which essentially
creates a default controller:

map.account ':action/:id', :controller => "account"

basically, this shortens my urls, where i once had:,
now can be accessed by (there are many other
commonly used actions in the account controller)

My problem is i cant have both of these lines together in my
routes.rb...basically, whichever one comes first, takes priority, and
wont let the other one behave as expected.

For example, if the map.user is first, and I enter:,
I will get an error sayin to user: 'login' found....if I put
map.account first, and enter, I will get an error
sayin no action userA found in controller account.

Does anyone know how to get around this? Is there a way to call a
default action in my account controller if no action is found? i can
search for a user that way.