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You could likely achieve it using Java Script too... by creating an onMouseOver action that links to a remotely stored flash object.... Assuming of course that the forum does not allow your sig to be flash in the first place.
If you've seen it in practice, i'd suggest it is more than likely a facility of the forum script than a user solution. The amount of work involved compared to the reality that 99% of boards will likely ban you for doing it does seem to justify the effort.
If you do find a way though, feel free to let me know... But please... DON'T post such a sig here...
Mike.
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