textTracking([tracking])
Returns the current tracking and sets it if argument tracking is given.
Type: function
Parameter(s):
- tracking {Number} Optional:The value to set. 
Returns:
- 
    {Number}:
 The current tracking. 
Returns the current tracking and sets it if argument tracking is given.
Type: function
Parameter(s):
The value to set.
Returns:
The current tracking.