Navigation is a critical aspect of good Web site design.
It's a critical aspect of site design that has a direct effect on the bottom line. Frames can also be a useful part of your navigation scheme, but don't overdo it. A navbar not only makes navigation easier, but is an integral part of a site's branding. When a user sees the navbar, they know what site they're on, and they know that they can get back to where they started any time, so they worry less about getting lost. Every page should have a navbar as an integral part of the layout of the page, which should be consistent throughout the site.