How do I float an image above the forum header? / Large header image??

[DiageoLiam]

Hey,
I'm trying to achieve the header design on http://www.forummonkeys.com/forums/ and wondered if anybody could help me achieve it?

I want my header to go across the entire of the top, not just the 800px width of my forum. How would I do this?

Thanks

Dan

[Seven Skins]

They are using one image as page background. You can do that by editing CSS "body class"

.

[DiageoLiam]

that doesn't work?! it just repeats it as the page background and doesn't hover above where the forum logo should go??