.link_thema a{
background-image: url(css_navigation_01.jpg);
text-decoration: none;
height:20px;
width:120px;
display:block;
float:left;
font-family: Verdana, Arial, Helvetica, sans-serif;
font-size: 0.75em;
font-style: normal;
font-weight: bold;
color: #990000;
text-decoration: none;
text-align: center;
margin: 0px 0px 0px 0px;
padding: 7px 0px 0px 0px;
}

.link_thema a:hover {
background-image:url(css_navigation_over_01.jpg);
color:#339933;
}

.link_material a{
background-image: url(css_navigation_02.jpg);
text-decoration: none;
height:20px;
width:120px;
display:block;
float:left;
font-family: Verdana, Arial, Helvetica, sans-serif;
font-size: 0.75em;
font-style: normal;
font-weight: bold;
color: #990000;
text-decoration: none;
text-align: center;
margin: 0px 0px 0px 0px;
padding: 7px 0px 0px 0px;
}

.link_material a:hover {
background-image:url(css_navigation_over_02.jpg);
color:#339933;
}

.link_aktuelles a{
background-image: url(css_navigation_03.jpg);
text-decoration: none;
height:20px;
width:120px;
display:block;
float:left;
font-family: Verdana, Arial, Helvetica, sans-serif;
font-size: 0.75em;
font-style: normal;
font-weight: bold;
color: #990000;
text-decoration: none;
text-align: center;
margin: 0px 0px 0px 0px;
padding: 7px 0px 0px 0px;
}

.link_aktuelles a:hover {
background-image:url(css_navigation_over_03.jpg);
color:#339933;
}

.link_kontakt a{
background-image: url(css_navigation_04.jpg);
text-decoration: none;
height:20px;
width:120px;
display:block;
float:left;
font-family: Verdana, Arial, Helvetica, sans-serif;
font-size: 0.75em;
font-style: normal;
font-weight: bold;
color: #990000;
text-decoration: none;
text-align: center;
margin: 0px 0px 0px 0px;
padding: 7px 0px 0px 0px;
}

.link_kontakt a:hover {
background-image:url(css_navigation_over_04.jpg);
color:#339933;
}

.link_service {
background-image: url(css_navigation_05.jpg);
text-decoration: none;
height:20px;
width:120px;
display:block;
float:left;
font-family: Verdana, Arial, Helvetica, sans-serif;
font-size: 0.75em;
font-style: normal;
font-weight: bold;
color: #990000;
text-decoration: none;
text-align: center;
margin: 0px 0px 0px 0px;
padding: 7px 0px 0px 0px;
}

.link_service a:hover {
background-image:url(css_navigation_over_05.jpg);
color:#339933;
}