Navigation is a very important issue not only from visitor's point of view but also from search engines point of view. In fact navigation can also be used to determine the importance of pages relative to the site structure. Many a times good seo’s tweak the navigation structure to gain better rankings for certain pages in search engines. At the same time it should not be forgotten that the same navigation will be used for human visitors. Hence a good navigation structure should be designed with both the visitors and search engines in mind.