print a web page

<script language="javascript" type="text/javascript">
                function CallPrint(strid) {
                    var prtContent = document.getElementById(strid);
                    var WinPrint = window.open('', '', 'letf=0,top=0,width=1,height=1,toolbar=0,scrollbars=0,status=0');
                    WinPrint.document.write(prtContent.innerHTML);
                    WinPrint.document.close();
                    WinPrint.focus();
                    WinPrint.print();
                    WinPrint.close();
                    prtContent.innerHTML = strOldOne;
                }
</script>

<div id="bill"></div>

<asp:button id="BtnPrint" runat="server" text="Print" onclientclick="javascript:CallPrint('bill');" xmlns:asp="#unknown" />
</div>