[Plugin: NextGEN Gallery] Compatibility with an old plugin

Hello, I have a problem with the compatibility of NGG and my old ImageManager 2.0 plugin (http://soderlind.no/archives/2006/01/03/imagemanager-20/) after upgrade to 1.9.5. The ImageManager is probably the only one usable and clean for our users (I really didn’t find any similar plugin). Do you think I am able to solve the incompatibility, please?

http://ww.wp.xz.cn/extend/plugins/nextgen-gallery/