Is it possible to reference an .html or .css file for the header and footer? I'm looking for a way to make simple sitewide changes without the use of frames. Is that possible? It seems easy, but my searches don't seem to come up with easy solutions. Right now I'm just looking for something that handles the header, navigation, and a footer that floats at the bottom, with other variables such as background color/image, paragraph styles, etc. Something where I can edit the .css file and the changes are sitewide. How difficult can this be?