Menu is Flickering at load time

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ASP.NET

I am using asp.net menu control using sitemap. There are three roll and according to roll menu item are display in menu.Menu are in master page. Its working well but while loading the page menu item are flicker(showing all the menu item of all roll for little bit time say 1/10 second) and its looking ugly. Please anyone told me what i do so that not flicker and working smooth. Some code are as follows

<asp:Menu ID="MenuHome" runat="server" DataSourceID="SiteMapHomeDataSource" StaticSubMenuIndent="16px" MaximumDynamicDisplayLevels="2" Orientation="Horizontal"  StaticPopOutImageUrl="~/images/menu_drop.jpg" CssClass="menu_horizontal" Font-Bold="True" DynamicEnableDefaultPopOutImage="False" ItemWrap="True" TabIndex="1"  ForeColor="#CC3300">
   <DynamicHoverStyle Font-Underline="True" />
   <DynamicMenuItemStyle ForeColor="Black" Font-Bold="False" BackColor="#F0F0F0" HorizontalPadding="5px" CssClass="textAlignLeft"/>
   <DynamicMenuStyle CssClass="menuItem_cantainer" ForeColor="Black" />
  <StaticHoverStyle CssClass="hoverFrontMenu" Font-Bold="True" />
</asp:Menu>

<asp:SiteMapDataSource ID="SiteMapHomeDataSource" runat="server" ShowStartingNode="false" SiteMapProvider="SiteMap" StartingNodeUrl="~/home.aspx"/>