update
use strict
change the cursor when the "Remove Solute" button is disabled
remove vestigial comment
comment
use pickable instead of cursor to disable button
change local var names
7/1/13 gray out the stroke of arrow button when it's disabled
7/1/13 temporary support for "press and hold" feature of arrow buttons, using JS timer and interval
7/1/13 fix problem with how arrow buttons were enabled/disabled, was causing exception at min/max values, and showing -0 for concentration
update