This will prevent your users from sorting through too many top level links to find information. Starting with the main index, draw links to the subject pages, e-mail addresses, external resources, etc. If secondary categories are needed, you will want to include secondary indices between the main index and the subject pages instead of direct links to the subject pages. Make sure that you try to differentiate between different types of pages to help visitors keep track of where they are. This can be achieved by using slightly different layouts, graphics, or link position for each type of page.
Graphics are an excellent way to identify where a visitor is in a site.
However, graphics should be kept simple - avoid too many animated images, large images or busy backgrounds. Total graphics on a page should not exceed 50 k. Use the same background throughout the site and repeat any other graphics when possible to decrease download speed. These will depend on the size of your site. If your site consists of only a few subject pages and a main index, you will probably want to include links to all the pages on every page.