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slight mod aolee
This discussion is related to the Online Users addon.
http://vanillaforums.org/discussion/comment/204142/#Comment_204142
I suppose you could also use Img function as well. but ... the above worked since in some configurations the online and offline pngs can't be found.
I may not provide the completed solution you might desire, but I do try to provide honest suggestions to help you solve your issue.
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