protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		response.setContentType("text/html");
		PrintWriter out = response.getWriter();
		HttpSession session = request.getSession();
		if (session == null || session.getAttribute("username") == null) {
			out.println("You haven't signed in yet!");
			response.sendRedirect("start.html");
		}
		ResultSet r = null;
		out.println("<form action = 'Return' method = 'post'>");
		out.println("<table>");
		try {
			r = DatabaseQuery.getResultSet("select * from borrowbook t1, books t2 where t1.bid = t2.bid and t1.id = " + session.getAttribute("username"));
			while (r.next()) {
				out.println("<tr>");
				out.println("<td>");
				out.println(r.getString("title"));
				out.println("</td>");
				out.println("<td>");
				out.println("<input type = 'checkbox' name = 'bid' value = '" + r.getString("bid") + "'>");
				out.println("</td>");
				out.println("</tr>");
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		out.println("</table>");
		out.println("<table>");
		try {
			r = DatabaseQuery.getResultSet("select * from borrowaudio t1, audios t2 where t1.aid = t2.aid and t1.id = " + session.getAttribute("username"));
			while (r.next()) {
				out.println("<tr>");
				out.println("<td>");
				out.println(r.getString("title"));
				out.println("</td>");
				out.println("<td>");
				out.println("<input type = 'checkbox' name = 'aid' value = '" + r.getString("aid") + "'>");
				out.println("</td>");
				out.println("</tr>");
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		out.println("</table>");
		out.println("<input type = 'submit' value = 'Return'>");
		out.println("</form>");
		out.println("<form action = 'PayFees' method = 'post'>");
		out.println("<table>");
		try {
			r = DatabaseQuery.getResultSet("select * from fees where id = " + session.getAttribute("username"));
			while (r.next()) {
				out.println("<tr>");
				out.println("<td>");
				out.println(r.getString("title"));
				out.println("</td>");
				out.println("<td>");
				out.println(r.getString("amount"));
				out.println("</td>");
				out.println("<td>");
				out.println("<input type = 'checkbox' name = 'fid' value = '" + r.getString("fid") + "'>");
				out.println("</td>");
				out.println("</tr>");
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		out.println("</table>");
		out.println("<input type = 'submit' value = 'Pay'>");
		out.println("</form>");
	}