Many amateur web designers do not understand the drastic effects frames can have on search engine visibility. Such ignorance is augmented by the fact that some Search Engines such as AltaVista are actually frames capable. AltaVista spiders can crawl through frames and index all web pages of a website. However, this is only true for a few Search Engines.
The best solution as stated above is to avoid frames all together. If you still decide to use frames another remedy to this problem is using JavaScripts. JavaScripts can be added anywhere and are visible to Search Engines. These would enable spiders to crawl to other web pages, even if they do not recognize frames.
With a little trial and error, you can make your frame sites accessible to both types of search engines.

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