I appreciate that there might be a problem with double voting with this set up, in the same way that going back and clicking on vote could be a problem.

As votes are registered by IP, the double-vote protection is server-side. Going back or re-clicking vote will not re-vote, but will tell you that you have already voted from that IP. 

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In reply to Re: optional pop-up window after clicking on vote by Juerd
in thread optional pop-up window after clicking on vote by EvdB

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