There is a very clever technique by Alexey Ten on providing an image fallback for SVG going around the internet recently. It does just what you want in the classic no-SVG-support browsers IE 8- and Android 2.3. If we dig a little deeper we find a some pretty interesting stuff including a bit of unexpected behavior that is a bit of a bummer without SVG fallbacks.
Read the rest of the article here: CSS-Tricks