Timesheets - UA Capability Detection

Hello all,

Is there a standard, recommended technique for detecting browser capability
when it comes to SMIL?  You may be aware of the FakeSmile library:
http://leunen.d.free.fr/fakesmile/

I would like to see hwo hard it would be to implement support for SMIL
Timesheets 1.0 into this library, but I would like to 'future-proof' the
library such that if (when) browsers start supporting it natively that the
script does not run.

I would like to be able to do this in Firefox, Opera, Safari, and Internet
Explorer.

Thanks,
Jeff