to print a gridview when paging is used

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C#

ASP.NET

SQL-Server

i have used a javascript for printing gridview data...

<script type="text/javascript">
        function printItn() {
            var prtGrid = document.getElementById('<%=grdreport.ClientID %>');

            prtGrid.border = 0;
            var prtwin = window.open('', 'PrintGridViewData', 'left=100,top=100,width=1000,height=1000,tollbar=0,scrollbars=1,status=0,resizable=1');
            prtwin.document.write(prtGrid.outerHTML);
            prtwin.document.close();
            prtwin.focus();
            prtwin.print();
            prtwin.close();
        }
    </script>

i have used paging in gridviews and evrytime it will be havin 5 to 6 pages. but this print button is printing only yhe first page which is visible... i want to print the whole gridview data.. pleas suggest me the changes in the above javascript or with any other code