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Cannot the BK image caching be somehow forced by HTML code? Or it is just a problem of internet browser? I find it annoying when those backgroud images always keep downloading and Maxthon (IE core) often crashes when user action is executed until page is fully loaded. OK, may be Firefox is better solution...
Harassed: All images should be cached by the browser by default. It is obvious because when someone updates the icon, other users still see the old one (cached by the browser) until they clear the cache or force a full reload by ctrl-f5. Which is another issue and will be addressed separately.