How do I make my Yahoo Portrait animate?

Ok, I have been asking a lot about how to convert image files to videos lately, but I haven't gotten the answers I need. So here is the question behind all my other questions, How do I make an animate yahoo profile portrait? Using inchworm animation (a Nintendo DSi Program) I made an animation, but it is written in an .SWF format, which yahoo does not understand. I also have all the individual frames, so I can make the animation myself, but I do not know which format to use.

I have seen other people with animate portraits, like one with a Beating Heart, and I want to have one too, but I don't know how. Help?

(P.S. My current Green Piggie portrait is actualy one frame out of the animation's eight frames, converted to .PNG format)