.net图片特效

Question

如题 效果是上面是大图下面是缩略图，移到小图大图显示相应的、基本效果已经实现 问题是，怎么样让他加载的时候显示数据表里面的第一个图的大图
代码如下
<div class="baobao">
                        <div class="eachBox" style="width: 749px; height: 500px;">
                            <div id="tbody">
                                <div id="mainbody">
                                    <asp:Panel ID="result" runat="server" Visible="false">
                                        <asp:Label ID="labt" runat="server"></asp:Label>
                                    </asp:Panel>
                                    <asp:Panel ID="big" runat="server" Visible="false">
                                    
                                    
                                    <img src="UpLoads/201111/dder3.jpg" alt="活动视频样板" width="640" height="400" id="mainphoto" rel="images/01.jpg"
                                        name="" />
                                    </asp:Panel>
                                    
                                </div>
                                <img src="images/goleft.gif" width="11" height="56" id="goleft" />
                                <img src="images/goright.gif" width="11" height="56" id="goright" />
                                <div id="photos">
                                    <div id="showArea">
                                        <!--
          SRC: 缩略图地址              
          
          
          REL: 大图地址            
          
          NAME: 网址
          
        -->
                                        <asp:Repeater ID="xianshi" runat="server">
                                            <ItemTemplate>
           <a href='voids.aspx?str=<%#Eval("Memo") %>'>   <img src='<%#Eval("Images") %> ' alt="" width="80" height="50" rel='<%#Eval("Images") %> '
                                                    name='voids.aspx?str=<%#Eval("Memo") %>' /></a>
                                            </ItemTemplate>
                                        </asp:Repeater>
                                        
                                    </div>
                                </div>
                            </div>
到这里肯定已经发现了 开始大图是直接的数据 而不是读的数据源里面的 ，请教这个问题怎么解决！