// Prompts for campaign donations
	public static double promptUserForCampDonation(double campGoal) {

		double donationAmount = 0.0; //Initialise donation amount variable
		double donationTotal = 0.0; //Initialise total amount variable
		while (donationTotal < campGoal) {

			try {
				donationAmount = Double.parseDouble(JOptionPane
						.showInputDialog("Please enter your donations, up to "
								+ campGoal));
			} catch (NumberFormatException e) {
				donationAmount = -1;

			}
			if (donationAmount < 0) {
				JOptionPane.showMessageDialog(null,
						"Error: please enter a valid donation amount: ");

			} else {
				donationTotal += donationAmount; //add the donation amount to the donation total
			}

		}
		return donationTotal; //Finally, return it! :)
	}