Multiple pages are not showing in the report

i am facing this problem when i deploy the RDL in Report Server, the
Muliple Pages and records are showing in the report properly. But when
i integrate this report to Application, multiple pages are not showing
in the report.

i am working in VS2005, SQL 2005

i have given the below page setting:

Page height -- 8.5 inch
Page width - 11 inch

the code which i had used in my aspx.cs file for calling the report in report server:

lnkBtnName.Attributes.Add("OnClick","window.open('" + reportURL +"', 'my_new_window','toolbar=no, menubar=no, titlebar = yes, scrollbars=yes, resizable=no, width=950px, height=650px')");

any ideas to resolve this problem.

Thanks
Vinod