Click to activate & use this control , every time a window is opened

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Every time I load a page with IE6 on which there is a flash movie , as I drag the mouse onto the movie , all the movie area behaves as a hit area button , even movies which have no button.
Then the following message comes up : *Click to activate and to use this control *;
As nothing has been changed by my will it can only have been changed by itself ?!
How to solve this ?
anyone to help me out , thanks

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