关于asp.net页面预览问题，新手求救！在线等啊

我想对填写完留言后先进行预览后，在发表，应该怎么样实现啊，
<div style="width:600px;text-align:left;margin-top:2px;padding-left:10px;line-height:25px;background-color:#6bbff9;font-size:14px;color:#fff;font:bold"> 
                请填写信息<span style="font-size: 12px">（*为必填项）</span>
             </div>    
             <table width="600" cellpadding="4">
                  <tbody>
                     <tr height="50">
                        <td align="right" width="100">
                            标题： 
                        </td>
                        <td>
                            <asp:TextBox id="DiscountTitle" Width="300" onblur=chkDiscountTitle() Runat="server"></asp:TextBox>&nbsp;&nbsp;*
                             <div id="DiscountTitleerror" style="display:none"></div>
                        </td>
                    </tr> 
                    <tr height="40">
                      <td align="right" width="100">有效日期：</td> 
                      <td>
                           <input id="StartTime" type="text" runat="server">
                           <img  onClick="fPopCalendar(StartTime,StartTime);return false;"  style="cursor:hand" src="/WebImage/Calendar.gif" >开始日期(例:2006-01-01)
                           <div id="StartTimeerror" style="DISPLAY: none"></div>
                       </td>
                    </tr>
                    <tr><td align="right" width="100"></td>
                        <td>
                         <input type="text" onblur="compareDate()" id="EndTime" runat="server">
                         <img  onClick="fPopCalendar(EndTime,EndTime);return false;"  style="cursor:hand"  src="/WebImage/Calendar.gif" >结束日期(例:2006-01-01)
                         <div id="EndTimeerror" style="DISPLAY: none"></div>
                         </td> 
                    </tr>
                    <tr height="40">
                        <td style="VERTICAL-ALIGN: top" align="right" width="100">
                            请输入内容：</td>
                        <td>
                            <asp:TextBox id="DiscountContent" width="300" height="150"  onblur=chkDiscountContent()   textmode="multiline" Runat="server" ></asp:TextBox>&nbsp;&nbsp;*
                            <div id="DiscountContenterror" style="DISPLAY: none"></div>
                         </td> 
                    </tr>
                    <tr>
                       <td></td>
                       <td>
                           <input type="button"  Value="预览" />
                       </td>
                    </tr>
                    
                    <tr height="40">
                        <td width="100">
                        </td>
                        <td>
                            <asp:Button id="AddDiscountButton"  onclick="Confirm_click" runat="server" Text="确 认"></asp:Button>
                        </td>
                    </tr>
                   </tbody>
                </table>