Frames, or the combining of HTML pages in a single browser window, is a controversial subject for site designers. But let's look at the pros and cons before you decide to add or not add frames to your site. Advantages to Using Frames Frames make is very easy to make changes to the navigation bar. Sites set up with a frames nav bar are incredibly easy to maintain. On a 500-page site, only one page needs changed for the navigation of all pages to change.
Frames provide a large degree of consistency to web pages throughout a site.
People know exactly where the navigation bar is every time. Using frames most likely means that no scrolling is necessary to find the navigation bar. Site designers can make the HTML so that offsite links appear in the larger frame instead of taking the visitor off site. Advertising frames can always be seen. Newer, embedded frames would be great for long lists of changing content if they were better supported by all browsers.