Hi I have a site with a two aspx pages and a masterpage.

masterpage.master
default.aspx
post.aspx

on the masterpage I have a treeview with a list of categories and when a category is selected I get a list of topics with a intro on each post.

URL example category: www.site.com/sports/soccer/europe/

  categories can go three-four levels deep and if I click a specific post I get into the post.aspx

URL example post: www.site.com/post/2342-Zlatan-scores-again

What I want to do is when im in the Post page I want to highlight the category to which it belongs in the treeview...but considering that each post is not in the sitemap file it just looses focus...so how can I set the selected treeview node to be www.site.com/sports/soccer/europe/ when im on the www.site.com/post/2342-Zlatan-scores-again page.

Thanks