public String toHTML() {
		String str = "<html>" + mission + "<br>at " + location
				+ "<br><b>"+ timeLeft + "</b> minutes left<br>"
				+ "&bull; <b>" + creditReward + "</b> credits";
		
		if (extraReward != null)
			str += "<br>&bull; <b>" + extraReward + "</b>";
		
		return str + "</html>";
	}