Cached a jquery object.
Made sure the indices are included in parseInt.
Tidied up use of css function.
Removed some function instantiations and cached some jQuery objects.
Cached more jQuery objects.
Removed enclosing function showDisplayBox().
Simplification of parameter name.
Ran through JSLint to tidy up code even more.
Changed version number from 0.9.0 to 0.9.1.