What are you trying to do exactly?
Do you want a fixed positioned header or have you just got rid of one?
If you want the header fixed then set it to position:fixed.You'll also need a background-color and z-index to keep it on top of content and to allow content to scroll underneath.
[B] position: fixed;[/B]
[B] z-index: 999;
Then initially you will need to pad the slideshow to make it appear below the header to start with.
[B] padding-top: 110px;[/B]
You would however be better of making the header flush with the top of the window because you will see the content scrolling underneath otherwise.