Menu Bottom Separator Image

Hello,
When I add a static bottom separator image to my menu control, it is displayed in design mode. However, it does not show on the web page when testing. It does not render and displays the white box with red x. My other images are showing fine. I am using Microsoft Visual Web Developer 2010 Express and IE for my browser. Here is my code.
<asp:Menu ID="Menu1" runat="server" DataSourceID="SiteMapDataSource2" ForeColor="Black" Font-Names="Cambria" style="font-size: large; font-weight: 700;" Font-Underline="True" StaticBottomSeparatorImageUrl="~/images/separator.jpg"> <StaticHoverStyle BackColor="Silver" /> </asp:Menu> <asp:SiteMapDataSource ID="SiteMapDataSource2" runat="server" showstartingnode=false/> Thanks for yo ...