How to get the language of the running InDesign?

Hi,

in my CS3 VB Script there is a a statement:

myParaStyle.KerningMethod = "Optical"

this code runs unter CS3 with English and German version of InDesign unchanged.

Now, with CS4, InDesign wants as parameter the strings "Optical" for Englissh, and "Optisch" for the German version.

How do I find out the language, InDesign is runnung?

P.S. Why is the parameter implementet as string and not as Identifier?

Thanks

Erwin