how to change the gltext screensaver in ubuntu

Actually i was trying in my ubuntu 7.10 to change the screen saver Textscreen.In windows operating system we are having the option to change.but in ubuntu we have to change the configuration.Screen saver configuration files will be in the path /usr/share/applications/screensavers.Now go that path type vim gltext.desktop.now by default the file will loook like this.

[Desktop Entry]
Encoding=UTF-8
Name=GLText
Comment=Displays a few lines of text spinning around in a solid 3D font. Written by Jamie Zawinski.
TryExec=gltext
Exec=gltext -root
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver
X-Ubuntu-Gettext-Domain=xscreensaver

If u want to add your text then edit Exec as as given below:here things will change now will be the text added.this will appear on GLTEXT screen saver

[Desktop Entry]
Encoding=UTF-8
Name=GLText
Comment=Displays a few lines of text spinning around in a solid 3D font. Written by Jamie Zawinski.
TryExec=gltext
Exec=gltext -text 'Things will change now !' -root
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver
X-Ubuntu-Gettext-Domain=xscreensaver