I used collapsible extender control in my datalist images, when I click on the image it worked but other images size gets decreased. how can I avoid that?

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I used collapsible extender control in my datalist images, when I click on the image it worked but other images size gets decreased. how can I avoid that?

THIS IS MY .ASPX CODE
-----------------------------

<form id="form1" runat="server">
    <asp:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server">
    </asp:ToolkitScriptManager>

    <div>
    <table border="1" cellpadding="10" cellspacing="10">
    <tr>
    <td rowspan="2" valign="top">
    <table>
    <tr>
    <td>
    <asp:Panel ID="Panel2" runat="server" BorderWidth="1"  >
            <asp:Image ID="Image3" runat="server"  ImageUrl="~/Images/sport_promachine.jpg" height="200"
                Width="600px"/>
        </asp:Panel>
    </td>
    </tr>
     <tr>

    <td  valign="top">
        <asp:DataList ID="DataList1" runat="server" RepeatColumns="3" OnItemCommand="Item_command" >

        <ItemTemplate >
        <div style="height:400">
            <asp:Panel ID="Panel1" runat="server" CssClass="pnlCSS" Height="140px"  Width="199px" BorderWidth="1" >
            <asp:Image ID="Image1" runat="server" ImageUrl='<%# Eval("PictureURL") %>' /><br />

           <div>
             <asp:LinkButton ID="LinkButton1" runat="server" Text='<%# Eval("Name")%>'  ></asp:LinkButton></div>
            </asp:Panel>
                    <div>
                     <asp:Panel ID="pnlCollapsable" runat="server"   CssClass="pnlCSS"
                       Width="199px" BorderWidth="1" ><%# Eval("Description") %>

          collapsoblepanelextender
            properties&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;--%>
                        <asp:LinkButton ID="LinkButton2" runat="server"  Text="More" CommandArgument='<%# Eval("Name")%>' CommandName="More" > </asp:LinkButton>

                      </asp:Panel>
                      </div>
                      <asp:collapsiblepanelextender
                        ID="CollapsiblePanelExtender1"
                        runat="server"
                        CollapseControlID="Panel1"
                        Collapsed="true"
                        ExpandControlID="Panel1"
                        TextLabelID="lblMessage"
                        CollapsedText="Show"
                        ExpandedText="Hide"
                        ImageControlID="imgArrows"
                        CollapsedImage="~/Images/down.jpg"
                        ExpandedImage="~/Images/up.png"
                        ExpandDirection="Vertical"
                        TargetControlID="pnlCollapsable"
                        ScrollContents="false"   >
                    </asp:collapsiblepanelextender>
   <%-- </div>--%></div>
    </ItemTemplate>
 </asp:DataList>

    </div>

THIS MY .CS CODE
--------------------------

protected void Page_Load(object sender, EventArgs e)
 {
     if (!IsPostBack)
     {
         GetData();

     }

 }
 public void GetData()
 {
     DataTable dt = new DataTable();
     //dt.Columns.Add(new DataColumn
     //("PictureID", typeof(Int));
     dt.Columns.Add(new DataColumn
                   ("PictureURL", typeof(String)));
     dt.Columns.Add(new DataColumn
                   ("Name", typeof(String)));
     dt.Columns.Add(new DataColumn("Description", typeof(String)));

     DataRow dr = dt.NewRow();
     //dr["PictureID"] = 1;
     dr["PictureURL"] = "~/Images/lowest_img1.jpg ";
     dr["Name"] = "lowestimage";
     dr["Description"] = "lowest image from datalist uiiuuy bhjyhjuyhbyu";
     dt.Rows.Add(dr);

     dr = dt.NewRow();
     //dr["PictureID"] = 2;
     dr["PictureURL"] = "~/Images/sport_gloves.jpg";
     dr["Name"] = "Gloves";
     dr["Description"] = "gloves from datalist gthghggf hjyuiyiknjhuj";
     dt.Rows.Add(dr);

     dr = dt.NewRow();
     //dr["PictureID"] = 3;
     dr["PictureURL"] = "~/Images/sport_promachine.jpg";
     dr["Name"] = "Promachine";
     dr["Description"] = "promachine from datalist yukyguuuuuuuuuu hhbjgjbuyhb";
     dt.Rows.Add(dr);

     dr = dt.NewRow();
     //dr["PictureID"] = 4;
     dr["PictureURL"] = "~/Images/techno_mouse.jpg";
     dr["Name"] = "Mouse";
     dr["Description"] = "mouse from datalist hjftrtgfhrhtryhghthy gvjhtghjt";
     dt.Rows.Add(dr);
     Session["datalist"] = dt;
     DataList1.DataSource = dt;
     DataList1.DataBind();
 }


 protected void Item_command(object source, DataListCommandEventArgs e)
 {
     if (e.CommandName == "More")
     {
         string name = e.CommandArgument.ToString();
         Response.Redirect("~/Category.aspx?Name=" + name, true);
         // Server.Transfer("~/testtop.aspx?Name=" + name, true);
     }
 }