the website i looked at was the site of the Westfield Tennis Club. this site has a fixed sidebar with ten links in it to the left and a fixed content box to the right. when you click on a link, it redirects to another page and the content in the box changes. for example, on the main page, the content does not describe the history of the club. but on the history page the content changes and describes the history of the club. nothing else on the page changes except for the content box, and this happens with every link on the page.