Please try like this:
="javascript:void(window.open(' http://prodsql02/reports/report/%D7%93%D7%95%D7%97%D7%95%D7%AA/%D7%A4%D7%A2%D7%99%D7%9C%D7%95%D7%AA/subreports/1_field_popup
¶m1=" & Fields!conclusions.value & " ','_blank','resizeable=1,toolbar=0,status=0,menu=0,top=20,left=20,width=740,height=730'))"
By the way, you may need to deploy the report to the server for test, it might not work in preview.
Regards,
Zoe
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