I don't really know crap about much. I usually just hack things up and test them till they work to my liking. (but it does work)
So below is a quick list of resources for all this cool shit with MooTools.
The below scripts can be found at http://www.phatfusion.net/
For http://www.phatfusion.net/multibox/
Click here for the mulit tut. and files
example I just put up with the page you get once you download. (I added the second image on the page that opens to a video)
http://imelementary.com/lboxtest/
For http://www.phatfusion.net/imagemenu/
(this ones really easy to get working)
I messed around with this one and it's really easy to figure out. Once you download it from the link above you can hack stuff up until you get what you want.
Try uploading the entire folder to your server and then test till you get what you want. If you open up the index file in your favorite html editor you can see the code you need.
I just went into the imageMenu.css folder to change it to match the index.htm file when I added images.
Here are some great tutorials below for all of this cool stuff at http://www.phatfusion.net/
http://beautyindesign.com/tutorial/increasing_user_experience_with_javascript.php
And then the one I linked to above again for using the mulitbox: http://woork.blogspot.com/2008/01/lightbox-using-mootools-and-pathfusion.html
More vid. tuts. below courtesy of http://www.speckyboy.com
http://speckyboy.com/2008/04/12/6-helpful-mootools-video-tutorials/
The 6 vids. are linked to above cover:
And of course I cannot forget a link to the PhatFusion forum http://forum.phatfusion.net/ (tons of help it looks like from browsing around in here)