The jpegs show progressively here. It's probably just a cache thing for you.
Regarding the Java: It shows fine in both Safari and Opera here. (Both right out of the box. I've done nothing special to enable Java on my MacBook.)
Opera for Windows used to have an option to download it with or without Java, with the Java download recommended. I don't know if that's still so, or what the fox does.
Unless I'm mistaken, a Windows computer without Java specifically installed (i.e. a non-techie, probably using IE) will not have much support for Java. I don't remember if current Windows comes with no Java at all, or if it's a very old version, but in either case Java most likely will need to be installed to be used.
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