Too bad--but that makes sense. I replaced "cancel" with one of my choices. It occurs to me that I could duplicate and rename the script for a second set of options.
I wanted to add some buttons for other off-line tasks like reading and grading (I'm a teacher), but when I edited the script, I got an error saying that only three buttons are allowed. I couldn't find a place in the script where that was specified--could you point me to the piece of code I would need to modify so that I can add more buttons?