Website Usability Guidelines

Follow these usability recommendations:

Website Navigation - It is important to use descriptive tab labels. Provide a clickable list of page contents on long pages, and add glossaries where they will help users select the correct link. In a well designed website, users do not get trapped in dead-end pages.
Website Navigation Page - Keep navigation pages short (one screen fold).
Website Sitemap - Include a sitemap to help users with website navigation. A sitemap should be broken into separate sections for products, services, company information, and other headings that are unique to your website.
Do not direct users into pages that have no navigation options. Many web pages contain links that open new browser windows. When these windows open the back button is disabled. Use return to previous page JavaScript to solve this problem.

Do not disable the browser back button. When you disable the back button you usually lose a customer. Users find the action very frustrating.
Do not make the user figure out the navigation for each page. Create a common navigation scheme for all pages.
Use a clickable index list. On a long page, provide a list of contents with links that take users to the desired content.
Provide page ID on new page links. User like to know where they are when they click a link.
Navigation Position - Place the primary in the left side-panel of the web page.
Tab Labels Position - Place tab labels at the top of the web page.
Most Important Key Point - Your website visitors must be able to find what they are looking for. Navigation is paramount to your website's ability to increase your conversion rate.