Problem in displaying arrow in asp.net menu control

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ASP.NET

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Hi,
I want to add arrow in my asp.net menu control but The arrow does not appear, please help me

*****css:

div.hideSkiplink
   {
       background-color: #630005;
       width: 100%;
   }

   div.menu
   {
       padding: 4px 0px 4px 8px;
   }

   div.menu ul
   {
       list-style: none;
       margin: 0px;
       padding: 0px;
       width: auto;
   }

   div.menu ul li a, div.menu ul li a:visited
   {
       background-color: #8A5050;
       border: 1px #A26F6F solid;
       display: block;
       line-height: 1.35em;
       padding: 4px 20px;
       text-decoration: none;
       white-space: nowrap;



   }
    div.menu a
    {
         color: #FFFFFF;
    }

   div.menu ul li a:hover
   {
       background-color: #A48C95;
       text-decoration: none;
       color: #FFFFFF;

   }

   div.menu ul li a:active
   {
       background-color: #A48C95;
      color: #FFFFFF;
       text-decoration: none;

   }

*****Page Aspx :

 <div id="div_Menu"  runat="server" class="clear hideSkiplink">
      <asp:Menu ID="NavigationMenu" runat="server" DataSourceID="XmlDataSource1"    Orientation="Horizontal" StaticEnableDefaultPopOutImage="false" DynamicEnableDefaultPopOutImage="false" StaticDisplayLevels="1" MaximumDynamicDisplayLevels="4" CssClass="menu" IncludeStyleBlock="false" StaticPopOutImageUrl="<%=cr.admin.Global.AdminApplicationUrl%>/images/arrowl.gif" DynamicPopOutImageUrl="<%=cr.admin.Global.AdminApplicationUrl%>/images/arrowl.gif">
<DataBindings>
     <asp:MenuItemBinding   DataMember="menuitem"  TextField="title" NavigateUrlField="url" />
  </DataBindings>
      asp:Menu>
<asp:XmlDataSource ID="XmlDataSource1" runat="server"></asp:XmlDataSource>
  </div>