JavaSCRIPT works with webtv. But as IMupChucKing stated, there has to be at least a link for us to move our "cursor" over it.
An example would be, that I believe if PC users put their cursor over a flag, it says what country it is? (I know it's something like that.. I could be wrong about exactly what it is.) But since the flags are not "clickable", we can't place our "cursor" over it, and get that information. So whatever it is you guys are talking about, I'm sure it most likely won't work with WebTV