How to Fix Navigation Links in one place?!?

[XHTMLboy]

Hello, I've been trying to get my navigation links to stay fixed into one place when I scroll my website. BUT, they seem to move out of place when I scrol. How can I fix this using CSS??? If you want to take a look at what I mean then here is the website I'm working on as a project. If you scroll the website the links will move and I want to fix this. http://brightonvinyl.com/v3/index.php It looks bad at the moment because I need to fix some things..

[dsonesuk]

header {position:fixed; top:0; left:0; right:0; z-index:9999;}

[XHTMLboy]

Thanks, also. On the website I cannot seem to style the sign in button correctly. What's the best way to style it so that it doesn't move when you resize the browser?? Thanks

[dsonesuk]

I haven't a clue what you are talking about?, it does absolutely nothing when you resize, just sits there at same place.

[XHTMLboy]

I'm talking about if I were to style it so it sits above with the rest but more to the right. What would I use to style it and how would I get it to stay at the same place even if I resize the browser?