Wallpaper swicher

I just downloaded a boatload of Tux wallpapers and I was wondering if there was a program that would switch the wallpaper every X minutes.
I was thinking it might be done in with a cron job but as a linux noob I wouldn't know where to start.
My window manager is XFCE 4.2.0 and my distro is Slackware 10.1, thank you.

I use this, you should change Esetroot to the program you use to set backgrounds (like fbsetbg), also the wallpaper directory and the time.

#!/bin/bash
while [ 1 ]; do
	FILELIST=`ls $HOME/multimedia/wallpapers/* | wc | awk '{print $1}'`
	let REM=$RANDOM%$FILELIST
	if [ $REM -lt 1 ]; then
		REM=1
	fi
	WALLPAPER=`ls -1 $HOME/multimedia/wallpapers/* | awk -v THIS=$REM '{ if ( NR == THIS ) print $0 }'`
	Esetroot -scale $WALLPAPER
	sleep 600
done

I started reading the XFCE manual and found out that you open up the "Desktop Settings" and under "Image" you select "New List..." you can make a list of backgrounds. Then you can run "xfdesktop -reload" it will pick a random background from the list.
So now I need to know how I can run that command every X minutes (without having to start a bash script every time I login)

With the command:

crontab -e

you start editing crontab, basically you'll need to put:

*/12 * * * *  xfdesktop -reload

Or put that line in a file and run: crontab file

PS: Running the script everytime you login is basically the same crontab does (my script sleeps 10 minutes so it changes background every ten minutes).. but well.. you want to use crontab

I put that in there but nothing happens.

bash-3.00$ ps ax | grep cron
2599 ? S 0:00 /usr/sbin/crond -l10

I've searched around the net a little bit and I see references to /usr/lib/cron/cron.allow but the file does not exist.

I've added "*/12 * * * * xfdesktop -reload" in my crontab file using "crontab -e" and cron is running (see above) but nothing is happening.
What Am I missing? Do I need to put my self in the crontabs allow list, if so where is it at?

When I login I can use su to become root and then type crond and it will work, but if crond is already running (above 2 posts) why is it not working?!?

Did you try using xfdesktop with full path, maybe crontab doesn't load all enviroment values when running commands.
I've checked if crontab -e added the command to my running cron daemon within my user and it does.

I tried but I still have to start crond manually. Could it be that its launched with "-l10" at the start?

Add this line to crontab -e: */12 * * * * echo "testing" > /home/youruser/crontest
If you wait 10 minutes and see a file called crontest in your home directory then the problem is xfdesktop, maybe you need to call it differently.
Oh, and when you add that command, take a look as root (others users can't) at /var/spool/cron/crontabs/ there you should see a file that has your user name and if you open it it has the crontab commands (adding the command there won't work).
crond -l10 makes crontab to be more verbose when showing errors, you can see that in it's man page.

PS: Are you saving the file when using crontab -e right? I don't want to offend, sometimes it happens

I added the echo testing thing and it created the file.
yes I can see /var/spool/cron/crontabs/<username> and yes im saving it with "crontab -e"
It's really weird tho, if I put in "/usr/bin/xfdesktop -relaod" or "xfdesktop -reload" it wont work unless I manually start crond, why is that?