request scope parameters in java

Hi All,

I am very New to opera browser.So not sure why does the request parameter 
become null.Is there any configuration settings in the browser needed?

Below are the steps to describe the problem.

please enter the site.

http://www.emeraldinsight.com/

Please click on 'Quick Search', type in the keyword
'anything', and hit 'Search'.

Then  select the top three articles  :

1.        Keeping the organization fit for anything
Author(s):Kippenberger, T
The Antidote; Volume: 3   Issue: 4; 1998 Research Paper
View HTML  | View PDF  (431 KB)

2.      Don't assume anything ...
Author(s):Kippenberger, T
The Antidote; Volume: 4   Issue: 2; 1999 Research paper
View HTML  | View PDF  (230 KB)

3.      Is there anything that won't be affected?
Author(s):Kippenberger, T
The Antidote; Volume: 4   Issue: 5; 1999 Conceptual Paper
View HTML  | View PDF  (157 KB)

With these three selected  click on 'Add to my list' and receive the
following
error:

"* We were unable to add items to you Session Marked List. Click 'OK', to
try
again."

Click 'OK' and trying again (several times) gets me the same error.

Now please create an account for you and log in
and try again,. After logging in you won't get an error, but the marked
list always shows as empty.

Then  log out and without doing another search click on 'MarkedList' and you
could see the  items  tried to add when logged in.
Sometime it behaves in other way too.
After logging out search for something & add them to the list.It keeps them
in session list.

Behind the scene what happens is
request.getParameterValues("chkContentIdList")  returns null in the Opera &
FF browsers.
To add them in the list I need the value.If the value is null It will give
the error mentioned above.

I have tried using IE7, Firefox 2 and Opera 9 (all with a cleared cache).
None
of them are working except IE7.


Thanks,
Vijaya.