we have a web app http://app.com/ , rewriting in .NET4

want to integrate CMS into it, to manage some main content pages for SEO, like the

http://app.com/Home, http://app.com/Games, http://app.com/Entertainment ....

and to incorporate multi-lingual as part of url path

http://app.com/en-us/Home, http://app.com/en-us/Games, http://app.com/en-us/Entertainment ....

We initially plan to setup the DNN as separate site, using alias app.com/cms

and we setup vir dir in our main site cms pointing to this dnn

We use IIS Url Rewrite to rewrite app.com/Home -> app.com/cms/Home (haven't look into how to tackle the language code path yet....)

The problem we just discovered is if user navigate to different content page, like from Home -> Games, the client url become app.com/cms/en-us/Games

is there a way to control the url to maintain app.com/en-us/Games ?

or something that's possible through Url Rewrite as well?