on clicking print button in report ,report get cleared.!how?

Question

on clicking print button in report ,pages are printed but  the report is getting cleared after that...it should not get cleared how to code..

following is the java script code in have used:
  

<input style="Z-INDEX: 111; LEFT: 737px; WIDTH: 53px; POSITION: absolute; TOP: 18px; HEIGHT: 19px; "

onclick="javascript:window.print();" type="button" value="Print" id="Button9"/>

    <CR:CrystalReportViewer ID="CrystalReportViewer1" runat="server" 

            AutoDataBind="true" DisplayGroupTree="False" DisplayToolbar="False" 

            HasCrystalLogo="False" HasDrillUpButton="False" HasExportButton="False" 

            HasGotoPageButton="False" HasSearchButton="False" 

            HasToggleGroupTreeButton="False" HasViewList="False" 

            HasZoomFactorList="False" SeparatePages="False"  />