Creating an array form labels of checkboxes

I would appreciate any help I can get with this.
I need to create a checksheet that has about 40 college classes on it and people need to be able to check off the classes that they have taken and hit a submit button and the result would be a dynamic text box that lists what classes they need to take next in clusters of 5.

I have started with a smaller version with 10 checkboxes, I had them in an array and was able to use the kirupa form tutorial to figure out how to display the classes that were checked.

There was a checkbox array thread posted here in November of 2003 and I tried to use that code to create an array from the labels of the unchecked boxes but that failed.
I am attaching both of my fla files and I would appreciate any help
Thanks