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Hah! I toyed with the idea of passing the image suffixes across using ‘content’, but browser support for content isn’t good enough. On the look out for another dirty way to pass strings from css to js though.
Nice. Although, as you say there are problems with having the incorrect src. Not just search engines but also dragging to desktop / save as / copy image. Also adds an extra http request for the spacer. Much cleaner solution though.