How to Open another jsp page from jsp page

Hi,
I am new to JSP. I need help to handle issue given below:
I have created one JSP Page for Login which contains Username and Password with a Submit Button. Once user inputs UserName and Password and Press Submit Button, It calls another JSP Page "Validate_login"
Validate_Login JSP does a JDBC call to Databse and validate User Name and Password. Now i want to open a "Employee.jsp" page if Username and Password matches with the one in database.
Pls advice what function or tag should i use to open this page in If (condition) true section.. I tried Window.open but it return back with error.

I tried with the function suggested by Doly. But nothing is happening. It doesn't redirect to any page. only a blank page comes.
here is complete code . pls correct me if i am wrong somewhere.
this is code of Validate_Login.jsp page which is invoked when user press login button on login.jsp.
my purpose is to validate username and password from database and redirect to employee.jsp if it is ok else back to login.jsp
here is source of Validate_login.jsp
=============================================================
<%@ page language="java" import="java.sql.*" pageEncoding="ISO-8859-1"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Validate Login</title>
</head>
<body>
<%
String username = request.getParameter("username");
String password = request.getParameter("password");
String viewPATH = "c:/MyData.mdb";
String dsnPATH = "jdbc:odbc:DRIVER=Microsoft Access Driver (*.mdb); " +
"DBQ="+viewPATH+"; " +
"UserCommitSync=Yes; " +
"Threads=3; " +
"SafeTransactions=0; " +
"PageTimeout=5; " +
"MaxScanRows=8; " +
"MaxBufferSize=2048; " +
"DriverId=281; " +
"DefaultDir=C:/ProgramFiles/CommonFiles/ODBC/DataSources";
Connection conn = null;
Statement stmt = null;
ResultSet rs = null;
try
     Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
     conn = DriverManager.getConnection(dsnPATH, "", "");
     stmt = conn.createStatement();
rs= stmt.executeQuery("SELECT * FROM Employee where emp_id='"+username+"'");
while(rs.next())
String pass = rs.getString("password");
if (pass.equals(password))
{ response.sendRedirect("Employee.jsp");}
else
{ response.sendRedirect("login.jsp");}
catch(Exception e)
e.printStackTrace();
finally
     if(stmt!=null) stmt.close();
     if(conn!=null) conn.close();
%>
</body>
</html>

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