User clicks one link and goes to other and comes back state maintain prob

Question

1st say 2 links r there,
aaa --> if u click on "aaa" (my requirement) as shown below.
problem : the bean values still maintaining when i go to "bbb" and come back to "aaa".
======
NOTE: when user enters all fields and clicks on button it goes to "second.jsp" their ajax response (1 table) generating. That means page wont get refreshed. (panel is fixed) only down 1 table will generate.
on FROM DATE AND TO DATE basis.
if user presses on F5 also state maintaining with the help of bean object.
i.e, say user in response table clicks on "page 5" then presses on F5 .
but problem is when user goes to "bbb" link or "ccc" or "dddd" (separate interface or link) which is not related to this
(they r nearly 50 interfaces or links) and comes back to "aaa" still old response is there.
NOTE: i can clear the bean object, but if i clear the bean object in "onload" or general i cant handle F5 issue.
bbb
ccc
ddd
sample
=====
first.jsp
=====
<jsp:useBean id="sd" class="TestPage" scope="session">
</jsp:useBean>
<jsp:useBean id="sptb" class="TestPageBean" scope="session">
</jsp:useBean>
<script type='text'/javascript'>
function testfun()
--ajax response.
forwarding to to
"second.jsp"
</script>
<%
HttpSession mdsession=request.getSession(false);
if(mdsession!=null){
String s1=sptb.getTxtname();
String s2=sptb.getTestselect();
%>
<form>
<table>
<tr><td><input type='text' name='fromdate' value='fromdate'></td></tr>
<tr><td><input type='text' name='todate' value='todate'></td></tr>
<tr><td><select name='testselect''><option value=1>aaa</option></select></td></tr>
<tr><td><input type='contains' name='txtname' value=''></td></tr>
<tr><td><input type='button' name='clickname' value='Click' onclick='testfun()'></td></tr>
</table>
</form>
<%
%>
second.jsp (this is ajax response)
=======
<%
String txtname= request.getParameter("txtname");
String testselect= request.getParameter("testselect");
String fromdate= request.getParameter("fromdate");
String todate= request.getParameter("todate");
--storing in bean
sptb.setTxtname(txtname);
sptb.setTestselect(testselect);
sptb.setTxtname(fromdate);
sptb.setTestselect(todate);
---database conn...resultset values retrieved on "fromdate" and "to date" basis
out.println("<table><tr><td>testeno</td><td></testename></td><td>fromdate</td></tr></td>");
while(rs.next())
out.println(rs.getString(3);
%>
output
====
input screen
1 fromdate
1 todate
1 selectbox
1 contains
1 button
-> after clicking on button ajax response displayed below is (with out page refresh)
1 table gets displayed on "FROM DATE" AND "TO DATE" BASIS
with pagination

Answer 1

Michael,
Thanks a lot for the reply.
In the case you have mentioned, how does application has to know the user is 'moving away'[clicking on other role] from the application.
Thanks in advance,
Regards,
Ganga