EmailToPhone Servlet | Email To Phone Code Review

This is the Servlet class to for the EmailToPhone application main page. The majority of the code is generate the HTML content for the above page. The code worth notice is the following:

EmailManager mgr = EmailManager.instance_;
                        String op = request.getParameter("action");
                        String opmsg = "";
                        if (op != null && op.length() > 0) {
                        if (op.equals("on"))
                        opmsg = mgr.startAlertThread();
                        else
                        opmsg = mgr.stopAlertThread();
                        }

When the Turn Alert On/Off link is clicked, the EmailManager starts or stops the Alert thread. The Turn Alert on is set as:

<a href="emailtophone?action=on">Turn Alert On</a>
Source Code 

                package vx.apps.email;

                import java.io.*;
                import javax.servlet.http.*;

                public class EmailToPhoneServlet extends HttpServlet
                {
                public void service(HttpServletRequest request, HttpServletResponse response)
                throws IOException
                {
                PrintWriter w = response.getWriter();

                w.println("<html>");
                w.println("<head>");
                w.println("<meta http-equiv=\"Content-Language\" content=\"en-us\">");
                w.println("<meta http-equiv=\"Content-Type\" content=\"text/html;
                                 charset=windows-1252\">");
                w.println("<title>EmailToPhone</title>");
                w.println("</head>");

                w.println("<<h1 align=\"center\"><u><font color=\"#000080\">Email
                            <font size=5>TO</font>Phone</font></u></h1>");

                w.println("<<h3 align=center><i>");
                        w.println("<font color=\"#B5B5FF\">Welcome to your phone gateway
                            for your email.</font></i></h3>");

                EmailManager mgr = EmailManager.instance_;
                String op = request.getParameter("action");
                String opmsg = "";
                if (op != null && op.length() > 0) {
                if (op.equals("on"))
                opmsg = mgr.startAlertThread();
                else
                opmsg = mgr.stopAlertThread();
                }

                w.println("<hr>");
                w.println("<ul>");
                    w.println("<li><p align=left>");

                            if (mgr == null)
                            w.println("EmailToPhone is not running. Please check
                            your setup and log file");
                            else {
                            if (mgr.isAlertStopped())
                            w.println("<font color = \"#0000FF\">Alert is off. Click here to " +
                                "<a href=\"emailtophone?action=on\">Turn Alert On</a>.");
                                else
                                w.println("<font color = \"#0000FF\">Alert is on. Click here to " +
                                    "<a href=\"emailtophone?action=off\">Turn Alert Off</a>.");
                                    }

                                    w.println("<br>");
                                    w.println("<font color=red>" + opmsg + "</font>");

                                    w.println("</li>");
                    w.println("<li>");
                        w.println("<p align=left>");
                            w.println("<a href=\"logfile\">Log File</a></li>");
                    w.println("<li>");

                        w.println("<p align=left><a href=\"emailsetup\">Setup</a></li>");
                    w.println("</ul>");
                w.println("<hr>");
                w.println("<p> </p>");
                w.println("<p> </p>");

                w.println("</body>");
w.println("</html>");
}
}