small performance improvement affecting all elements, but which was particular   bad with checkboxes. minor changes to checkbox code - fix highlight glitch - simplify code
small performance improvement affecting all elements, but which was particular
  bad with checkboxes.
minor changes to checkbox code
- fix highlight glitch
- simplify code


jarib/watir,watir/watir-classic,jarib/watir,watir/watir-classic,jarib/watir,watir/watir-classic,watir/watir-classic