.nav_buecher {
   color: #333333;
    display: block;
    font-size: 120%;
    height: 34px;
    margin-bottom: 0;
    margin-left: 10px;
    margin-right: 0;
    margin-top: 5px;
    padding-bottom: 0;
    padding-left: 5px;
    padding-right: 20px;
    padding-top: 5px;
    text-decoration: none;
}

nav_b {
   color: #333333;
    display: block;
    font-size: 120%;
    height: 34px;
    margin-bottom: 0;
    margin-left: 10px;
    margin-right: 0;
    margin-top: 1px;
    padding-bottom: 0;
    padding-left: 1px;
    padding-right: 20px;
    padding-top: 1px;
    text-decoration: none;
}