Thanks for all the suggestions.  I was able to make the "disable_with" 
solution work with an IMG by converting it to xml before storing, e.g.,

    _disable_with=IMG(_src=URL('static', 'images/spinner.gif')).xml()


so I'm all set.

-- 
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- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
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