How to make Modality backword compatible?

Hi,
Our project uses both 1.5 and 1.6. 1.6 has this modality types like Dialog.ModalityType.DOCUMENT_MODAL which can be passed in as a argument in the Constructor specific to 1.6.
So , previous 1.5 constructor was just JDialog(Frame owner, String title, boolean modal) .
How can I make modality compatible with 1.5 ?

Use only the methods available in 1.5.

The modality extension is specific to Java 1.6, it is not available in earlier releases. Not only the methods are missing in the API, the other needed library code is simply not there. If your application needs these new modes, it cannot be run on 1.5.

Maybe your application might test the JRE version and use the 1.6 features only when available, disallowing or limiting functions that cannot be fully implemented in 1.5; however, I've no idea how - or whether at all - is this doable.

Thanks a lot Martin !