Helpservice called with javascript leads to a blank page

Dear Gurus!!!!!
First of all thanks a lot for your future answers.
I am desperatly trying to open a help service within a web template.
I had a look to the following post
Unable to Call Help Service Class
and also to the "enhance web printing" how to document.
Both documentation were really helpfull.
The service I call works perfectly.
The problem is that when I call the service, it leads to a session timeout.
I do not know what I can do.
Here is the javascript embended in my web template code:
The objective is to write the selected date from the drop down box into the table TVARVC (this is what my service does).
// I get the selected date from the drop down box
selected_date=document.getElementsByName("FILTER_VALUE_1")[0].options[selectedindex].text;
//I get the SAP_BW_URL
BW_URL='<SAP_BW_URL>';
// I fill the CMD part of the final url
cmd="&CMD=PROCESS_HELP_WINDOW&help_service=ZTVARVC_INTERVAL&item=DROPDOWNBOX_1&TEXT="+selected_date;
// I assign the new url calling the service to the document location
location.href = BW_URL + cmd;
<strike>When I execute the web template, the date is correctly set into the table TVARVC but the session always times out.
"400 Session timed out - please log in again"
</strike>h
The html page result is a blank page and the web template result disappear.
To sum up, I just would like to write the selected date from the dropdown box into the table TVARVC without affecting the template result html page.
Can you please help me?
Thanks a lot!
regards,
Cyril Naudes.
PS: no need to ask for valuation... I will do it of course valuate the helpfull answers!
Message was edited by:
 Cyril Naudes
Message was edited by:
 Cyril Naudes
Message was edited by:
 Cyril Naudes

I have found a temporarily solution which consists in opening the location in a new window and to close it just after... It is not really what I want to have, but it will solve my issue.
Regards,
Cyril.

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Helpservice called with javascript leads to a blank page

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