CS6 png save options

I've got a major script I use that performs .png saving every few seconds, but apparently there are some new compression options in CS6.  Is there a way for me to have the script use the "Smallest / Slow" compression option if CS6 is in use?  I currently use the script below for saving:

 function SavePNG(){    permSaveFile = new File(permSaveFile);    pngSaveOptions = new PNGSaveOptions();    activeDocument.saveAs(permSaveFile, pngSaveOptions, true, Extension.LOWERCASE);
}

How would I add the extra CS6 save option in while still being able to use the script with older versions as well?  The rest of the script works fine and it saves fine under CS6; the only reason I need to change this is, the output files are HUGE using it, as is, under CS6.  Thanks for any help!

dgolberg