我的菜单

<div id='cssmenu'>
        <ul>
           <li class='active'><a href='index.html'><span>Inicio</span></a></li>
           <li><a href='#'><span>Veiculos</span></a>
                <ul id="submenu">
                    <li><a href='#'><span>Cadastrar</span></a></li>
                    <li><a href='#'><span>Consultar</span></a></li>
                    <li><a href='#'><span>Devolver</span></a></li>
                </ul>
           </li>
           <li><a href='#'><span>Sobre</span></a></li>
           <li class='last'><a href='#'><span>Contato</span></a></li>
        </ul>
    </div>

我的CSS

    @import url(http://fonts.googleapis.com/css?family=Capriola);
    /* Let's import the lovely google font, please keep this line at the top of your stylesheet */
    /* Menu CSS */#cssmenu,#cssmenu ul,#cssmenu ul li,#cssmenu ul li a {
      padding: 0;
      margin: 0;
      line-height: 1;
      font-family: 'Capriola', sans-serif;
    }
    #cssmenu:before,#cssmenu:after,#cssmenu > ul:before,#cssmenu > ul:after {
      content: '';
      display: table;
    }
    #cssmenu:after,#cssmenu > ul:after {
      clear: both;
    }
    #cssmenu {
      zoom: 1;
      height: 69px;
      background: url(ImagensCSS/bottom-bg.png) repeat-x center bottom;
      border-radius: 2px;
      width: 100%;
    }
    #cssmenu ul {
      background: url(ImagensCSS/nav-bg.png) repeat-x 0px 4px;
      height: 69px;
    }
    #cssmenu ul li {
      float: left;
      list-style: none;
    }
    #cssmenu ul li a {
      display: block;
      height: 37px;
      padding: 22px 30px 0;
      margin: 4px 2px 0;
      border-radius: 2px 2px 0 0;
      text-decoration: none;
      font-size: 15px;
      color: white;
      text-shadow: 0 1px 1px rgba(0, 0, 0, 0.75);
      font-weight: 400;
      opacity: .9;
    }
    #cssmenu ul li:first-child a {
      margin: 4px 2px 0 0;
    }
    #cssmenu ul li a:hover,
    #cssmenu ul li.active a {
      background: url(ImagensCSS/color.png) center bottom;
      display: block;
      height: 37px;
      margin-top: 0px;
      padding-top: 26px;
      color: #004f7c;
      text-shadow: 0 1px 1px rgba(255, 255, 255, 0.55);
      opacity: 1;
    }

    #cssmenu li ul {
        display: none;  
    }

    #cssmenu li:hover ul {
        display:block;
    }

    #cssmenu li:hover li {
        float:none; 
        top:0;
    }

    #submenu {
        margin:0;
        padding:0;
        display:block;  
    }

    #submenu li{
        background: url(ImagensCSS/nav-bg.png) repeat-x 0px 4px;
        height: 69px;
        margin:0;
        padding:0;
        display:block;
    }


    #footer {
        position: fixed;
        bottom: 0;
        width: 100%;
        background: url(ImagensCSS/nav-bg.png) repeat-x 0px 4px;
        color:#FFF;
    }

    #banner {
        background: url(ImagensCSS/Banner.png);
        width:800px;
        height:200px;   
    } 

拜托，能帮我一个吗？