default encoding problems

my old server is redhat 7.1 + tomcat 4.0 + mysql
I fix my problems by
1. add LANG=th_TH to catalina and
2. add <%@ page contentType="text/html; charset=TIS620" %> to my jsp page
This can solve my problems.... but!!

my new server is redhar 7.3 + tomcat 4.1.10 + mysql
I can't use my old code... it display "???" with any data that download from mysql database(I try to display it on console "System.out.println(x)" it show the correct encoding.)
I fix my new problems by delete <%@ page contentType="text/html; charset=TIS620" %>" but it have new problem!!! user should change his encoding every time (IEMenu->view->encoding->Thai)
How to set default to Thai?
or I should fix my problem by other way?
Thank you.
ps. I already have "<meta http-equiv="Content-Type" content="text/html; charset=windows-874">" in my code.

The browser picks up the encoding of the response object. Therefore, you need to set the encoding on the response before it is sent to the client.
For example,
response.setContentType("text/html;charset=TIS620");

Where I should add that like?
mycode:
<%@ page import="messages.*" %>
<%@ page import="java.util.*" %>
<%@ page contentType="text/html; charset=TIS620" %>
<html>
<head>
<title>Home :: PeTerPan</title>
<meta http-equiv="Content-Type" content="text/html; charset=windows-874">
</head>
<body bgcolor="#FFFFFF" >
แสดง <%=messages.getValue("1")%>
<% System.out.println(comm.getValue("1")); %>
</body>
</html>
browser result:
แสดง ???
console result:
แสดง ทดสอบภาษา

Are you accessing your JSP directly, or forwarding to it from a servlet?
Try placing it in your JSP.

directly to JSP

I try to add this line
<%response.setContentType("text/html; charset=tis-620");%>
But it's work..
please help me.