Thanks for the suggestions.  I'd rather not have scrolling if possible, but that's an option if nothing else works.  I put the form in its own container, but that didn't make a difference.  Here's what I've figured out so far.
1. The issue is consistent in Ffx, Chrome, and IE 11.
2. The iframe code in the script generated by FB has a height specified in it.  I can manually adjust the window height and that solves the problem.  However, I would think that a javascript should adjust the height of the window.
3. I've noticed on other sites on which I use FB forms, FB does not adjust the iframe height after submitting the form.  (I don't know if this is supposed to happen.)
I'm wondering how I can get a javascript to read the contents of the iframe window and then adjust the height of the iframe to match it.
            
                                    
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