Setting screensaver to run over login window

OK, I have read up on how to get a screensaver of my choice running over the login window, and I did it and it works... sort of.
If I set the root user to use a iPhoto folder of family photos as the screensaver, it doesn’t work. Is this just not possible?

tried this script:
#!/bin/bash
screenSaverEngine='/System/Library/Frameworks/ScreenSaver.framework/Versions/Cur rent/Resources/ScreenSaverEngine.app/Contents/MacOS/ScreenSaverEngine'
# first we check to see if we are at the loginwindow
if (( `/bin/ps -awwxco command,user | /usr/bin/grep '^loginwindow ' | /usr/bin/grep -c 'root'` > 0 )); then
# next we look to see if the screensaver is already running
if (( `/bin/ps -awwxco command,user | /usr/bin/grep -c '^ScreenSaverEngin '` < 1 )); then
# and finally, we check to see that we have been idle long enough
minIdleTime=`/usr/bin/defaults -currentHost read com.apple.screensaver idleTime`
if [ -z "$minIdleTime" ]; then
minIdleTime=900
fi
idleTime=`/usr/sbin/ioreg -c IOHIDSystem | /usr/bin/awk '/HIDIdleTime/ {print $NF/1000000000; exit}'`
idleTime=`/bin/echo "scale=0; $idleTime/1" | /usr/bin/bc`
if (( $idleTime > $minIdleTime )); then
moduleName=`/usr/bin/defaults -currentHost read com.apple.screensaver moduleName`
if [ -n "$moduleName" ]; then
$screenSaverEngine -module $moduleName &
else
$screenSaverEngine &
fi
fi
fi
fi
exit 0
and got these errors:
2008-03-11 09:46:22.001 defaults[256:10b]
The domain/default pair of (com.apple.screensaver, idleTime) does not exist
2008-03-11 09:46:22.071 defaults[263:10b]
The domain/default pair of (com.apple.screensaver, moduleName) does not exist
bash-3.2# Tue Mar 11 09:46:22 sjqutest77963a ScreenSaverEngine[264] <Warning>: 3891612: (connectAndCheck) Untrusted apps are not allowed to connect to or launch Window Server before login.
2008-03-11 09:46:22.366 ScreenSaverEngine[264:10b] Can't register screen saver connection 'com.apple.ScreenSaverDaemon'
_RegisterApplication(), FAILED TO establish the default connection to the WindowServer, _CGSDefaultConnection() is NULL.
this one I found interesting: "Untrusted apps are not allowed to connect to or launch Window Server before login."

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