I have to say, that doesn't make alot of sense. You're concerned that the user is either using an outdated browser or has JavaScript disabled, but you want to use Prototype to create some effects after the fact. It's somewhat of a catch-22.

If you have even a basic client side validation in place, it can catch most problems before submission. The odds that your user base is using updated browsers and have JavaScript enabled I'm sure greatly outweighs the opposite. The only caveat, as I mentioned previously, is to never rely on JS alone but have an even better validation method on the server.

__________________

I reject your reality, and substitute my own.