Hi all.
I'm doing a site's content based on a vocabulary "cities" that contains the city names referenced by a node story. Every node is linked to one city. So every city have different stories.
Every city have a special url: city.mysite.com.
I don't want every time to create a new site so I have used this solution to make a unique site using only different taxonomies:
in my template preprocess function i create a template variable $portal which contains the city name taken form the url. The header easily change because is a print of $portal.jpg and i haven't to change anything but the views.

And this is my problem: how do i do to make a view based on $portal variable?
I want to see only the nodes that have the taxonomy term equals to $portal (the city name in the url).

thank you in advance