Flash Signature Animations

OK, so i have made an animation for a different message board that i post on.

I want to put the animation in my signature. Does the board need somting active, or do i have to do somthing sneaky to put it on?

Can you just put it in using HTML? If so, what tag do i use?

Would i have to embed it into an HTML document, if yes how do i put it in my sig?