I would like to have a header that is set to 100% width but have the main content, sideboxes etc... be at a fixed width lets say 770px. I am using v1.3.6.

When I look at the style sheet it appears that the header wrapper is contained in the main wrapper and specifying a width for the header it is being contained by the main wrapper. Does anyone have ay ideas what I would need to modify to make this work? Any help would be appreciated.