Reprot问题


<body>
    <form runat="server" id="task">
    <input type="text" id="type" value="," style="display: none" />
    <asp:ScriptManager runat="server" ID="ScriptManager1" EnableScriptGlobalization="true"
        EnableScriptLocalization="true">
    </asp:ScriptManager>
    <script language="javascript" type="text/javascript">        document.onkeypress = function esckey() {            if (event.keyCode == 27)//点击“ESC”键
            {                window.close();
            }        }        function ReturnValue() {            window.opener.document.all.ctl00_ContentPlaceHolder_returnvalue.value = document.all.ctl00_ContentPlaceHolder_Parameters.value;
            window.opener.document.all.ctl00_ContentPlaceHolder_SupplieProductSave.click();
            document.all.ctl00_ContentPlaceHolder_Parameters.value = "";
        }
    </script>
    <asp:UpdatePanel ID="MainPanel" runat="server">
        <ContentTemplate>
            <div class="print_panel" >
                <div class="print_tit">
                   <a href="#" class="print_pdf" onclick="window.open(document.getElementById('ctl06').ClientController.m_exportUrlBase + encodeURIComponent('PDF'), '_blank')" >PDF</a>
                    <a href="#" class="print_excel"  onclick="window.open(document.getElementById('ctl06').ClientController.m_exportUrlBase + encodeURIComponent('Excel'), '_blank')">Excel</a> <a href="#" onclick="window.close()" class="close">
                        (ESC)关闭 X</a>
                </div>
                <div class="pr_c_panel">
                   <Reprot:ReportViewer ID="ReportViewer" runat="server"  Width="700px" Height="700px">
                   </Reprot:ReportViewer>
                </div>
            </div>
        </ContentTemplate>
    </asp:UpdatePanel>
    </form>
</body>
问题：进入页后，使用ESC，页面关闭。单击Reprot后，esckey()事件不好用，页面无法关闭，请求支援！