SUN & MS Applet compatability

Hi,

We have an applet that is built in J++ (argh!)
I have to now convert the thing to be supported in all JVMs.

One problem I have is the J++ code is full of conditional compilation
directives, referencing:

PolicyEngine.assertPermission(PermissionID.NETIO);

When compiled for MS JVM.

Is there an equivalent I can use that is generic across JVMs?

Am I barking up the wrong tree here? Our applet will be signed, I just need
to be able to support all JVMs (MS, SUN 1.3n, 1.4n etc)

Steve