Search engines support frames and iframes to the extent that they can. Frames can cause problems for search engines because they don?t correspond to the conceptual model of the web. In this model, one page displays only one URL. Pages that use frames or iframes display several URLs (one for each frame) within a single page. Google and other search engines try to associate framed content with the page containing the frames, but can?t guarantee that they will.
If you?re concerned with how your site appears in the Google search results, please read Search Engines and Frames 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. Read more about the ?NoFrames? tag.