If you're concerned with how your site appears in the Google search results, please read "Search Engines and Frames" at http://www.searchenginewatch.com/webmasters/frames.html.
This document describes the use of the "NoFrames" tag to provide alternate content. If you use wording such as "This site requires the use of frames," or "Upgrade your browser," instead of providing alternate content on your site, then you'll exclude both search engines and individuals who've disabled frames on their browsers. For example, audio web browsers, such as those used in automobiles and by the visually impaired, typically do not support frames. You can read more about the "NoFrames" tag in the HTML standard at http://www.w3.org/TR/REC-html40/present/frames.html#h-16.4.
source : google.com/webmasters/