jsp login page and to show wrong password on another html page

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HTML

JSP

I have login form on index.html ..and when user login then action="Login.jsp" is called
if user enter wrong username/password.
then I want that mycode show invalid username or password on index.html page


login.jsp

if(ch==0)
                     {
                        System.out.println("incorrect username or password ");

                        // what code should i write here doing the above same

                     }
                     else
                     {
                         //if username and password match
                         System.out.println("logged in as "+cstmt.getString(3));
                            session.setAttribute("user",cstmt.getString(3));
                            session.setAttribute("username",cstmt.getString(4));

                     response.sendRedirect("Home.jsp");
                     }