how to print panel in asp.net

<blockquote class="FQ"><div class="FQA">Quote:</div><script type=’text/javascript">

function printform()
        {
             var printContent = document.getElementById(’<%= pnlForm.ClientID %>’);
             var windowUrl = ‘about:blank’;
             var uniqueName = new Date();
             var windowName = ‘Print’ + uniqueName.getTime();
             var printWindow = window.open(windowUrl, windowName, ‘left=50000,top=50000,width=0,height=0′);

             printWindow.document.write(printContent.innerHTML);
             printWindow.document.close();
             printWindow.focus();
             printWindow.print();
             printWindow.close();
        }

</script>

<asp: Panel runat=’server’ id=’pnlForm’ >

      <asp:GridView is=’grd1′…[gridview, datasource markup goes here]

 </asp: Panel>

  <input type=’button’ value=’print’  önclick=’printform();’ /></blockquote>