I can't work this out :-(
everything else moves but that main picture and 3 buttons to the right
Lee, Take a look at the CSS for the other parts that are working. You have them defined with a width and the Margin:auto which is making them center.
To correct your header, you should provide a wrapper for the header components, and make sure you define the width, position:relative since you are using absolute position for the slideshow, and set the margin to '0 auto' which will create no top or bottom margin, but center to container.
CSS Example:
#header-wrap{
width:1000px;
margin:0 auto;
position:relative;
height:363px;
}
Hope this helps, Chad