public void actionPerformed(ActionEvent event) {
			if (!equation.equals("0") && !equalsRepeat) {
				theReturn = "" +  CalcScript.calculate(holder, currentInput, operation);
				holder = theReturn;
				lastValue = currentInput;
				currentInput = theReturn;
				returnField.setText(currentInput);
				equalsRepeat = true;
			}
			if (!equation.equals("0") && equalsRepeat) {
				theReturn = "" + CalcScript.calculate(lastValue, currentInput, operation);
				holder = theReturn;
				currentInput = theReturn;
				returnField.setText(currentInput);
			}
		}