Asp.Net Menu item separator displayed below menu items

Hi,

   I a using asp.net menu control for generating a menu. I have set "separatorimageurl" property for menu items, but the separators are appearing below the menu items. Below given is the markup. Could you please help me in resolving this issue.

    <asp:Menu runat="server" ID="customeMenu" RenderingMode="List" Orientation="Horizontal"             DynamicPopOutImageUrl="~/Images/right-arrow.gif" StaticPopOutImageUrl="~/Images/drop-arrow.gif"              Height="15px" >             <Items>                <asp:MenuItem Text="User Management" Value="UserManagement"  SeparatorImageUrl="Images/Separator1.png">                     <asp:MenuItem Text="Manange Users" ToolTip="Manange Users" NavigateUrl="About.aspx" />                     <asp:MenuItem Text="Change Password" ToolTip="Change Password" NavigateUrl="DatePicker.aspx" />                 </asp:MenuItem>                 <asp:MenuItem Text="System Management" Value="SystemManagement" SeparatorImageUrl="Images/Separator1.png">                 </asp:MenuItem>                <asp:MenuItem Text="Test Management" Value="TestManagement" SeparatorImageUrl="Images/Separator1.png">                 </asp:MenuItem>                 <asp:MenuItem Text="Result Management" Value="ResultManagement" SeparatorImageUrl="Images/Separator1.png">                </asp:MenuItem>                 <asp:MenuItem Text="Label Management" Value="LabelManagement" SeparatorImageUrl="Images/Separator1.png">                 </asp:MenuItem>                 <asp:MenuItem Text="System Diagnostics" Value="SystemDiagnostics" SeparatorImageUrl="Images/Separator1.png">                 </asp:MenuItem>                 <asp:MenuItem Text="Logout" Value="Logout"></asp:MenuItem>             </Items>                         <StaticMenuItemStyle BackColor="#B0A47F" Font-Bold="True" Font-Names="Arial" Font-Size="Small"                 ForeColor="Black" HorizontalPadding="7px" VerticalPadding="3px" />             <DynamicMenuItemStyle BackColor="#B0A47F" Font-Bold="True" Font-Names="Arial" Font-Size="Small"                 ForeColor="Black" HorizontalPadding="7px" VerticalPadding="3px" />             <%--<StaticHoverStyle BackColor="green" Font-Bold="True" Font-Names="Arial"                 Font-Size="Small" ForeColor="Black"/>--%>             <StaticHoverStyle BackColor="#C0C0C0" Font-Bold="True" Font-Names="Arial" Font-Size="Small"                 ForeColor="Black" />             <DynamicHoverStyle BackColor="#D5CBAB" Font-Bold="True" Font-Names="Arial" Font-Size="Small"                 ForeColor="Black" />         </asp:Menu>

Thanks,

Harish