JavaScript自訂強制回應對話方塊

<script language=javascript>
        function openDialogWin()
        {
            var result = window.showModalDialog("ShowMessage.aspx","","dialogHeight:160px; dialogWidth:300px; status:no; help:no; scroll:no");
            //window.show('ShowMessage.aspx', '','height=300, width=400, top=250, left=250, toolbar=no, menubar=no, scrollbars=no, resizable=no,location=no, status=no','_blank');
            if(result == "Yes")
                window.alert("You Clicked Yes!");
            else if(result == "No")
                window.alert("You Clicked No!");
            //document.writeln(result);
        }
    </script><input type=button value="按鈕" name="btn" onclick="openDialogWin()" />

            Response.Write("<script language='javascript'>");
            Response.Write("function confirm(){ window.returnValue='Yes';window.close(); }");
            Response.Write("function cancel(){ window.returnValue='No';window.close(); }");
            Response.Write("</script>");
            Response.Write("<div align='center'><input type='button' value='Yes' onclick='confirm()' /><input type='button' value='No' onclick='cancel()' /></div>");