ASP.NET Css Menu question

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CSS

Hi i am using sitemap provider to create my menu.

How can I remove the first menu item ,which is null, from getting displayed.

Please see image of my menu here.

here

<?xml version="1.0" encoding="utf-8" ?>
<siteMap xmlns="http://schemas.microsoft.com/AspNet/SiteMap-File-1.0">
  <siteMapNode  url=""  roles="*">
    <siteMapNode url="Default.aspx" title="Home"  description="" roles="*"/> 
  </siteMapNode>
</siteMap>