You can use the <FRAME> html tag. Though I wouldn't recomment using frames at all due to SEO reasons. Go and Google for a Javascript instead if what you want to remain static is an Image
I'm not sure what you mean by a header, but if you want a floating image/ div/ layer, then maybe this will help you: http://www.jtricks.com/javascript/navigation/floating.html
Fgsg, I think that you mean style="position:fixed" HTML: You have to insert this style into block of your header.