In splitting or combining message text, it should be one-to-one correspondence
with a resource key.

src/plugin/src/share/classes/sun/plugin/panel/UpdatePanel.java:
line 221-
            str1 = (String)at.getItemAt(at.getSelectedIndex());
            String atstr = msgfmt.format(new String[]{str1});

            if (RButton1.isSelected()) {
                day.setVisible(false);
                every.setVisible(false);
                whenLabel1.setText(" ");
                whenLabel2.setText(atLabelText);
                whenPanel1.add(dummyLabel);
                whenPanel2.add(at);
                at.setVisible(true);
                dummyLabel.setVisible(true);
                str = mh.getMessage("advanced_desc1.text");
                str1 = null;
            } else if (RButton2.isSelected()) {
                day.setVisible(false);
                dummyLabel.setVisible(false);
                whenLabel1.setText(everyLabelText);
                whenLabel2.setText(atLabelText);
                whenPanel1.add(every, c);
                whenPanel2.add(at);
                every.setVisible(true);
                at.setVisible(true);
                str1 = (String) every.getItemAt(every.getSelectedIndex());
                str = mh.getMessage("advanced_desc2.text");
            } else if (RButton3.isSelected()) {
                dummyLabel.setVisible(false);
                every.setVisible(false);
                whenLabel1.setText(dayLabelText);
                whenLabel2.setText(atLabelText);
                whenPanel1.add(day);
                whenPanel2.add(at);
                day.setVisible(true);
                at.setVisible(true);
                str1 = String.valueOf(((Integer)day.getValue()).intValue());
                str = mh.getMessage("advanced_desc3.text");
            }
            if (str1 != null) {
                msgfmt = new MessageFormat(str);
                str = msgfmt.format(new String[]{str1});
            }
            descLabel.setText(str+atstr);
                      :
    private String atText = mh.getMessage("advanced_at.text");

src/plugin/src/share/classes/sun/plugin/resources/ControlPanel.java:
        { "update.advanced_desc1.text", "Perform scan every day " },
        { "update.advanced_desc2.text", "Perform scan every {0} " },
        { "update.advanced_desc3.text", "Perform scan on day {0} of every month " },
        { "update.advanced_at.text", "at {0}" },

These message resources should be:
        { "update.advanced_desc1.text", "Perform scan every day at {0}" },
        { "update.advanced_desc2.text", "Perform scan every {1} at {0}" },
        { "update.advanced_desc3.text", "Perform scan on day {1} of every month at {0}" },