remove fading of background during logout in a SunRay-Session

When you logout from the Solaris 10 System, the background is faded darker.
In a SunRay-Environment this causes multiple screen redraw with network-

To deactivate the animation, this blog from Chris Gerhard was very useful for

Insert into /etc/gtk-2.0/gtkrc for the system or ~/.gtkrc for the user:
gtk-enable-animations = 0