[Chameleon] Setting quality for JPEG output

[Tyler Mitchell]

Jacob,
I just discovered your drawmap mods for setting imagetype based on layer 
metadata -- very good!
http://lists.maptools.org/pipermail/chameleon/2004-August/001253.html
It is just what I have been needing.

Does anyone know if I can set the compression/quality for JPEG output? 
I know how I'd do it in a map file, but $szImgType in drawmap.php seems 
to only refer to image format, not sub-settings for that format.

Can anyone give me some pointers?

Tyler