Easy way to do this would be to create a shutdown script
In the file, add these simple lines
sudo /sbin/shutdown -t3 -h now
If you are running PCMANFM with icons on the desktop here is what you do
open a terminal, cd to the ~/Desktop directory
make a copy of one of the .desktop files in it and name it "shutdown.desktop"
cp home.desktop shutdown.desktop
edit the file and change these lines
Exec=sh ~/.shutdown.sh # This is the script you created previously
Leave the rest of the file alone
That should give you your desktop icon...
This could be annoying though... if they mistakenly click the wrong icon, then you'd have them asking you to "fix" it all the time..[/code][/code][/code][/code][/code][/code]