Only needed a graphics program to slice up the header image. Edited the XHTML and CSS by hand.
I think it would have worked without splicing if you had just positioned the header as relatiive - it establsihes the header as a containing block. Then include the movie as a child of the header. Then the movie can use absolute positiioning - offset from the header.
The only difference from that and my approach was that I used absolute positioning to place the image pieces around the movie.
Setting the width of the header and then using "margin: 0 auto" centers it horizontally in the page.