Reload object value from session

Hi, I use a for loop to get object value "JPEG" from servlet.
My servlet create different value of "JPEG".
But the result is JPEG keeps in its first value.
The value won't change!!
Can anyone tell me how to solve this bug ??
Thanks in advance
<%
String x[] ={"80" ,"241" ,"401" ,"561" ,"80" ,"241" ,"401" ,"561" ,
"80" ,"241" ,"401" ,"561" ,"80" ,"241" ,"401" ,"561" };
String y[] ={"40" ,"40" ,"40" ,"40" ,"161" ,"161" ,"161" ,"161" ,
"281" ,"281" ,"281" ,"281" ,"401" ,"401" ,"401" ,"401" };
for (int i=0;i<10;i++){
String jpeg = (String) session.getValue("JPEG");
int jpeg_ch = Integer.parseInt(jpeg,10);
%>
<img style="position: absolute; left:<%= x[jpeg_ch] %>; top:<%= y[jpeg_ch] %>; width: 160; height:120;" Src="http://192.168.10.110:8080/servlet/Servlet?jpeg=<%= jpeg_ch %>">
<%
%>

<code>
for (int i=0;i<10;i++){
String jpeg = (String) session.getValue("JPEG");<i>// Wrong</i>
int jpeg_ch = Integer.parseInt(jpeg,10);
%>
// That should be the following:
String jpeg;
for (int i=0;i<10;i++){
jpeg = (String) session.getValue("JPEG");<i>// Wrong</i>
int jpeg_ch = Integer.parseInt(jpeg,10);
%>
</code>

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Description:
1) We are using iplanet distributed session
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Reload object value from session

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