Most spiders don't download images to begin with so you won't save that much if any at all. Your Yahoo increase is probably just coincidence.
You can however display a more SEO friendly style by limiting the over all page sizes (increase loading times) by removing javascript, flash animations, etc etc, and improving the content to code ratio. Both are only small ranking factors though but if you do enough small ones, it starts to help over competitors who do not.
Displaying different content is just that, different content. If you display a page about horses to Google and then when a visitor is there its about Dogs you'll be penalized.
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