Report 10g in Web Browser

Hello,
I used to develop with Forms 6i, now I'm using Forms 10g (from Oracle Developer Suite 10g).
By pressing a button within a form, I'd liked to see the respective report in the webbrowser.
Here is the code how it was implemented with Forms 6i:
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PROCEDURE call_rep_datesearch IS

para_id_form PARAMLIST;
para_id_rep PARAMLIST;

--p_sessionid NUMBER;

BEGIN
para_id_rep := GET_PARAMETER_LIST('ein_param');
--
IF NOT ID_NULL(para_id_rep) THEN
DESTROY_PARAMETER_LIST(para_id_rep);
END IF;
--
para_id_rep := CREATE_PARAMETER_LIST('ein_param');

ADD_PARAMETER(para_id_rep,'p_starttime',TEXT_PARAMETER,TO_CHAR(:SEARCHFIELD.STARTDATE,'dd.mm.yyyy')) ;
ADD_PARAMETER(para_id_rep,'p_endtime',TEXT_PARAMETER,TO_CHAR(:SEARCHFIELD.ENDDATE,'dd.mm.yyyy'));

-- Ask for parameters: NO or YES
ADD_PARAMETER(para_id_rep,'PARAMFORM',TEXT_PARAMETER,'NO');
-- ADD_PARAMETER(para_id_rep,'PARAMFORM',TEXT_PARAMETER,'YES');

RUN_PRODUCT(REPORTS,
'rep_datesearch.rep',
SYNCHRONOUS, RUNTIME,FILESYSTEM ,para_id_rep, NULL);
--DELETE REPORT_TABLE WHERE id = p_sessionid;

--FORMS_DDL('COMMIT');

NULL;
END call_rep_datesearch;
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What has to be changed ?