span.extlink {
    position: absolute;
    left: -3000px;
    top: -3000px;
    width: 0;
    height: 0;
    overflow: hidden;
    display: inline;
}

/*
Aussehen der Links */

a.extern:link {
display: block;
text-decoration: none;
font-family:Verdana, Arial, Helvetica, sans-serif;
font-size: 9pt;
color: #000000;
background: url(images/external.gif) no-repeat 100% 0; padding: 0 20px 0 0;
width:140px;
height:20px;
text-align:center;
line-height:20px;
}

a.extern:visited {
text-decoration: none;
font-family:Verdana, Arial, Helvetica, sans-serif;
font-size: 9pt;
color: #000000;
background: url(images/external.gif) no-repeat 100% -100px; padding: 0 20px 0 0;
width:140px;
height:20px;
text-align:center;
line-height:20px;
}

a.extern:hover, a.extern:active, a.extern:focus  {
text-decoration: none;
font-family:Verdana, Arial, Helvetica, sans-serif;
font-size: 9pt;
color: #000000;
background: #f1f1f1 url(images/external.gif) no-repeat 100% -200px; padding: 0 20px 0 0;
width:140px;
height:20px;
text-align:center;
line-height:20px;
}