<% session = request.getSession(false); %> 


<%
session.setAttribute("username",null);
session.setAttribute("bumen",null);
session.setAttribute("systemop",null);
session.setAttribute("lastlogintime",null);
session.setAttribute("onlineuser",null);
session.setAttribute("myboard",null);
session.setAttribute("newmsg",null);
%>
<script language=javascript>
window.close();
opener.location=opener.location;
</script>