Do not know how to call Servlet from a JSP???

How do I call a Servlet from a JSP page?
I have an JSP page that does a few things but when there is an error I need the JSP page to call a Servlet but do not know how to do it.
I want to call a ServletFaillogin from a JSP page how can I do it?
<html><head>
<title> Login Page </title>
</head>
<body>
<%@ page import= "portal.* " %>
<jsp:useBean class="portal.PortalSystem" id="bean" scope="session" />
<% try
String servername = request.getParameter("servername");
String username = request.getParameter("username");
String password = request.getParameter("password");
bean.Connect(servername, username, password);
catch(Exception e)
//******Here I need help *********
action="http://localhost:8080/test/servlet/ServletFaillogin";
%>
<h1> You have successfully logged in. </h1>
</body></html>

I have changed the code but get error, why??
I think it could be due to the way classes are located,
All my HTML and JSP pages are at:
C:\tomcat\jakarta-tomcat-3.3.1\webapps\myJSPs\jsp\portal-project
The class ServletFaillogin is located here:
C:\tomcat\jakarta-tomcat-3.3.1\webapps\myJSPs\WEB-INF\classes\portal
What am I doing wrong, please help???
<html><head> <title> FTP Login </title> </head>
<body>
<%@ page import= "portal.* " %>
<jsp:useBean class="portal.PortalSystem" id="bean" scope="session" />
<%      try
           String servername = request.getParameter("servername");
           String username   = request.getParameter("username");
           String password   = request.getParameter("password");
           bean.Connect(servername, username, password);
        catch(Exception e)
           response.sendRedirect("http://localhost:8080/myJSPs/servlet/ServletFaillogin");
%>
<h1> You have successfully logged in. </h1>
</body></html>

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