Determining supported elements via Javascript

All,

As you know, the Mozilla implementation of SVG doesn't support
elements.

In particular, support for the animation elements is not yet complete.

In order to animate SVG documents, you must use Javascript.

What I'd like to be able to do is determine whether an SVG animation
element is supported and, if it is, use it. If it isn't, I can fall
back to JS animation.

Does anybody know of a way to do this?

Thanks

Dan