jquery selectbox fail

Hello Guys,

I have a big problem..
If I open my blog the URL looks like this.
http://www.blog.de
So now I open a category with the jquery selectbox.
the link is http://www.blog.de/category/audiophile/

all fine.
So now, If I open my blog and change to “english” the URL looks like this
http://www.blog.de/en/
If I open a category the URL looks like this.
http://www.blog.de/en/en/category/audiophile/

The second /en/ have to delete but I don’t know how?!
Have somebody a solution or an idea?

cgee