I have what might be a dumb question. If I have a CSS file that declares 5 different graphic headers (one for each site section), does each page have to load the 5 headers that are in the global CSS file, meaning, does the load time for one page increase because it's loading the other 4 headers in the background? hope that make sense, thanks.
yes they will if is part of the same css file. Best create 4 small css files for each header and based on content, querystring, url load the right one.