And they are colored properly to suit the buttons and tabs. Left frame is a basically image with a bunch of necessary buttons. And each button is mapped using mapping tool to a proper page which is operated on co-ordinate basis. That means left frame is always constant and never changes for the entire site. And the links are static which allows fast browsing on main sections and does t take time download every time as it is already cached to the client browser.
Right frame is whole lot of one image embedded with small other images for easy browsing.
Right frame is designed in such a way that it looks same on each and every page through out the entire site , but the functionality of each page is so different from other and it is totally dependent on the main selection selected on the left frame. And each image is named meaningfully , so that user can understand the functionality of that section when clicked on that image.