I can't do it all for you because I'm at work and don't have the right tools with me, but I can tell you what to do.
I think the best way to do it would be to take the example you found there, copy it, edit it, then use it yourself.
Firstly, if you right-click it, you can see it uses Macromedia Flash Player 7. That means that the voting field is a .swf file. You'll need to copy that file so we can edit it. I'll assume you're using Internet Explorer or something very similar. Go to Tools->Internet Options, then in the Temporary Internet Files box, click 'Delete Files...'. Check the box to delete offline content as well, then click 'OK'. Now, open your temporary Internet folder (which you can find by clicking 'Settings' and then 'View Files...' in the Internet Options window). It should be empty. Refresh your example page there and then refresh your temporary Internet folder and you should find that there are now 4 files in there. One of them will be 'encuesta_marca.swf'. Copy that to your desktop or something.
After you install the Flash decompiler, run the program and have it open the encuesta_marca.swf file that you copied. It should decompile it and give you the source code for the voting box. All you have to do is edit some of the code so it asks your question and says 'Yes' or 'No', then publish/compile the new file as 'yourvoteboxfilename.swf' and you're laughing!
It's a bit long-winded and seems a bit complicated, but it works.
you can do something similar with simple scripting.. for example, set up a form with radios for yes and no with a submit button.. your script would automatically switch the selection to yes if the no button was clicked.
not as "flashy" but same basic idea. there's other cute things you can do along the same lines....
if it really MUST be flash, the effect being used is a simple one to apply... just run through the flash tutorials and it'll be pretty clear (sorry, nowhere near my computer with flash installed, so can't point ya any closer in the right direction)