private static void setButtonStyle(JButton b, Type type) {
		Color foregroundColor = null;
		Color backgroundColor = null;

		switch (type) {
		case CONST:
			foregroundColor = Color.WHITE;
			backgroundColor = CONST_COLOR;
			break;
		case CONTROL:
			foregroundColor = Color.WHITE;
			backgroundColor = CONTROL_COLOR;
			break;
		case IMPORTANT:
			foregroundColor = Color.WHITE;
			backgroundColor = IMP_COLOR;
			break;
		case FUNCTION:
			foregroundColor = Color.BLACK;
			backgroundColor = FUNCTION_COLOR;
			break;
		case ENTER:
			foregroundColor = Color.WHITE;
			backgroundColor = ENTER_COLOR;
			break;
		case REGULAR:
		default:
			foregroundColor = Color.BLACK;
			backgroundColor = Color.WHITE;
			break;

		}
		b.setForeground(foregroundColor);
		b.setBackground(backgroundColor);
		Border line = new LineBorder(Color.BLACK);
		Border margin = new EmptyBorder(5, 15, 5, 15);
		Border compound = new CompoundBorder(line, margin);
		b.setBorder(compound);
	}