is it possible to change the response content type auf portal?
for my portal the response content type is as follows:

Server: Apache-Coyote/1.1
X-powered-by: Servlet 2.4; JBoss-4.0.4.CR2 (build: CVSTag=JBoss_4_0_4_CR2 date=200604241359)/Tomcat-5.5
Content-Type: text/html;charset=UTF-8
Transfer-Encoding: chunked
Date: Fri, 27 Jul 2007 05:55:51 GMT
200 OK

but i want to change UTF-8 to ISO-9859-1
in my jsp template i have
<%@ page contentType="text/html;charset=ISO-8859-1" pageEncoding="ISO-8859-1" %>
but with no effect
is there another place/config where i can change this?