bind picture to a datagrid in a tabular fashion

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ASP.NET

I want to display picture in a tabular format,but with the following code below,each picture is keep inserted vertically,
i want picture to be displsy say in a(say)4 * 4 format.please help me

<asp:GridView ID="GridView1" runat="server" AllowPaging="True" AllowSorting="True"
        AutoGenerateColumns="False" BackColor="White" BorderColor="#3366CC" BorderStyle="None"
        BorderWidth="1px" CellPadding="4" Height="204px"
        HorizontalAlign="Justify" PageSize="5" Width="56px" ShowHeader="False" >
        <Columns>
            <asp:TemplateField>
                <ItemTemplate>
                 <asp:HyperLink ID="HyperLink1" runat="server" NavigateUrl='<%# geturl(DataBinder.Eval(Container.DataItem, "img_id"))%>'><asp:Image ID="Image1" runat="server" Height="40" ImageUrl='<%# FormatURL(DataBinder.Eval(Container.DataItem, "img_id")) %>'
                        Width="40" /></asp:HyperLink>
                </ItemTemplate>
            </asp:TemplateField>
                                 </Columns>
        <FooterStyle BackColor="#99CCCC" ForeColor="#003399" />
        <SelectedRowStyle BackColor="#009999" Font-Bold="True" ForeColor="#CCFF99" />
        <PagerStyle BackColor="#99CCCC" ForeColor="#003399" HorizontalAlign="Left" />
        <HeaderStyle BackColor="#003399" Font-Bold="True" ForeColor="#CCCCFF" />
        <PagerSettings NextPageImageUrl="photogallary.aspx" PageButtonCount="4" />
        <RowStyle BackColor="White" ForeColor="#003399" />
    </asp:GridView>