ul#navigation {
    position: fixed;
    margin: 0px;
    padding: 0px;
    top: 10px;
    left: 0px;
    list-style: none;
    z-index:9999;
}
ul#navigation li {
    width: 100px;
}
ul#navigation li a {
    display: block;
    margin-left: -2px;
    width: 100px;
    height: 70px;    
    background-color:#CFCFCF;
    background-repeat:no-repeat;
    background-position:center center;
    border:1px solid #AFAFAF;
    -moz-border-radius:0px 10px 10px 0px;
    -webkit-border-bottom-right-radius: 10px;
    -webkit-border-top-right-radius: 10px;
    -khtml-border-bottom-right-radius: 10px;
    -khtml-border-top-right-radius: 10px;
    -moz-box-shadow: 0px 4px 3px #000;
    -webkit-box-shadow: 0px 4px 3px #000;
    opacity: 0.6;
/* filter:progid:DXImageTransform.Microsoft.Alpha(opacity=60); */
}
ul#navigation .especialidad a{
    background-image: url(especialidad.png);
}
ul#navigation .gis a      {
    background-image: url(sig.png);
}
ul#navigation .webmail a      {
    background-image: url(email.png);
}
ul#navigation .youtube a      {
    background-image: url(youtube.png);
}
ul#navigation .flickr a      {
    background-image: url(flickr.png);
}
ul#navigation .dokeos a      {
    background-image: url(dokeos.png);
}

ul#navigation .blog a      {
    background-image: url(blog.png);
}

ul#navigation .registro a{
    background-image: url(registro.png);
}

ul#navigation .convocatoria a{
    background-image: url(convocatoria.png);
}

ul#navigation .facebook a      {
    background-image: url(facebook.png);
}