popup window in a rdlc report

Question

i want a report which have a list as a hyperlink....................on the link in the report ..i coded this thing in its URL.................................................................................................................................. ="Javascript:void(window.open('help.aspx?ID="&Fields!ID.Value +"','mywindow','toolbar=0,width=500,height=500'))" ....................................................................................this opens a new window.. . . . how can i get the same thing on a popup?

can anybody help?

thanxx..