How to install flash from a web page?

    The question is on fire. Very very urgent.

    How to make a web page try to download a flash player if it is not installed? I’ll explain - there are sites that you visit (through IE - everything is fine in Fox) and the message “web page is trying to install flash player plugin” or something like that appears. but there are - on which it does not appear (but flash objects are present on them). How to make the first? (naturally, by all examples, there is no player on the computer).

    Help !!!

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