Incorporate Lynda's code. Add Help function. Code cleanup.
Update for Lynda' s code. Replace double-quotes by single quotes.
Fix revisions requested by Johann
Merge pull request #22 from phuppe/ph_testing1

Incorporate Lynda's code. Add Help function. Code cleanup.
Lynda beginning changes with radio button
after review
after second review
Merge pull request #23 from lmccallum/groups

Lynda beginning changes with radio button
Merge branch 'master' into fix-wcag