repeater 中js 获取元素 同级节点问题


 <asp:Repeater ID="Repeater1" runat="server" OnItemCommand="Repeater1_ItemCommand" OnItemDataBound="Repeater1_ItemDataBound">
      <ItemTemplate>
           <div class="p_img">
                <asp:Image ID="Image1" runat="server" BorderWidth="1" ImageUrl='<%# Eval("src","{0}") %>' />
                <img alt="" style="width:320px; height:320px; position:absolute; display:none;" src='<%# Eval("src","{0}").Replace("160x160","320x320") %>' />
           </div>
      </ItemTemplate>
 </asp:Repeater>
我给Image1添加了onmousemove事件，具体功能是控制同级img控件的显示，Image1的parentNode节点和nextSibling节点均不能获取，但能获取Image1的ClientID，有没有人知道怎么做？