forum Problem - layout

Hi.

I posted earlier about "my" forum, and got some great pointers on how to embed it with my layout using the templates.

Well, I got another problem. The forum pages changes in width, wich messes up my layout.

Almost all the time, the forum is about 5 centimeters too wide. But on some pages, such as the login page, the width is exactly the way I want it.

Anyone of you guys that can help me fix this?

The forum is at: http://ettannatlopp.nu/forum

I set up a test user, user: tester and pwd tester

Try to login using tester and then logout. Then you´ll see what I mean. I cant figure it out.
Yes i am adding same thing here to
http://www.hindimoviesong.net