anchor.diff:              if(startDay.length <= 0 || (isNaN(startDay*1))) {
                   isDataCorrect = false;
                   resetElement("periodError",
  -                  "ERROR: Start Day must be positive, negative, or zero.", "red");
  +                  "ERROR: Start Day must be positive, negative, or zero.", "black");
               }
               return isDataCorrect;
           }
  
positive.code:             if (duration.length <=0 || ((isNaN(duration*1)) || (duration <=0))) {
                  isDataCorrect = false;
                  resetElement("periodError",
                    "ERROR: Duration must be a positive number.", "red");
              }
              return isDataCorrect;
          }
  
negative.code:             if (repetitions.length <=0 || ((isNaN(repetitions*1)) || (repetitions <=0))) {
                  isDataCorrect = false;
                  resetElement("periodError",
                                    "ERROR: Repetitions must be a positive number.", "black");
              }
              return isDataCorrect;
          }
  