Changing JRE version for browsers?

Is there a way to change the default version of JRE Firefox/IE uses?

let me answer that with a question: why would you want that? :wink:

How about wanting to check compatibility and performance of an applet with different JREs?

My guess is that he wants to use a different default JRE, but he needs to give more information just to make sure :wink:

[quote]How about wanting to check compatibility and performance of an applet with different JREs?
[/quote]
use the applet viewer ???