try a polycutter(found one long time ago which was free, but cant remember).
YOu should be able to reduce the polys with it, without loosing visual apperiance
yes, i've used a tool from 3D Studio Max and i've reduced polygons. However, the model still has a lot of plygons, so I decided to use only the arms, they have 12500 polygons after reduction, from 30000 polygons before reduction. The complete model reduced has more than 60000 polys from 190000 that it has before, so i can't use the complete model