Permalink problem...

Hi !

I have a problem with my permalinks. Thanks to the Wordpress settings, I have an other page (with a custom template) as the default page and the posts are displayed in an other page wich is called "News".

When I click on "News" in my menu, I have a page with "www.mydomain.com/news" for url and the page display all the posts excerpt. When I click on a post title, I have a page with "www.mydomain.com/blog/YEAR/MONTH/DAY/TITLE" for url. I don't understand why I have this "blog" in the middle of the url ?

When I go to the permalinks settings I can't put "blog" out of the url :s !
I'm using a twentyeleven theme based, just modified a little bit.

Help me please :p