private void jMenuItem3ActionPerformed(java.awt.event.ActionEvent evt) {
		treePopupMenu.setVisible(false);
		String chosBox = null;
		String deleFilename = "";
		try {
			if (tree.getLastSelectedPathComponent().equals(recvBox)) {
				chosBox = "ռ";
				deleFilename = "user/" + user.getUsername() + "/recvBox.dat";
			} else if (tree.getLastSelectedPathComponent().equals(postBox)) {
				chosBox = "";
				deleFilename = "user/" + user.getUsername() + "/postBox.dat";
			} else if (tree.getLastSelectedPathComponent().equals(draftBox)) {
				chosBox = "ݸ";
				deleFilename = "user/" + user.getUsername() + "/draftBox.dat";
			} else {
				chosBox = "";
				deleFilename = "*.dat";
			}
			if (JOptionPane.OK_OPTION == JOptionPane.showConfirmDialog(null,
					"ȷ" + chosBox + "?", "ȷ", JOptionPane.OK_CANCEL_OPTION)) {
				if (deleFilename.equals("*.dat")) {
					File file1 = new File("user/" + user.getUsername()
							+ "/recvBox.dat");
					if (file1.exists())
						file1.delete();
					File file2 = new File("user/" + user.getUsername()
							+ "/postBox.dat");
					if (file2.exists())
						file2.delete();
					File file3 = new File("user/" + user.getUsername()
							+ "/draftBox.dat");
					if (file3.exists())
						file3.delete();
				} else {
					File file1 = new File(deleFilename);
					if (file1.exists())
						file1.delete();
				}
			}
		} catch (Exception e) {
		}
	}