hab's schon, wen's interessiert:
<html>
<head>
<title>Unbenannt</title>
<style type="text/css">
<!--
a {
font-family: Verdana, Arial;
text-decoration: none;
}
.diagrammOn {
color: #FFFFFF;
background-color: #AA00AA;
}
.diagrammOff {
color: #000000;
background-color: #EEEEEE;
}
-->
</style>
<script type="text/javascript">
// Anzahl der Links pro Gruppe
var linkCount = 3
function changeClass(wo, gruppe) {
// Alle Links in der Gruppe zurücksetzen
for(i = 1; i <= linkCount; i++) {
if(document.getElementById("link_"+gruppe+"_"+i))
document.getElementById("link_"+gruppe+"_"+i).className = "diagrammOff";
}
// Ausgewählter Link
wo.className = "diagrammOn";
}
</script>
</head>
<body>
<a href="#" class="diagrammOn" onclick="changeClass(this,'a')" id="link_a_1">bla 1</a>
<br><br>
<a href="#" class="diagrammOff" onclick="changeClass(this,'a')" id="link_a_2">blö 1</a>
<br><br>
<a href="#" class="diagrammOff" onclick="javascript:changeClass(this,'a')" id="link_a_3">blub 1</a>
<br><br>
<br><br><br><br><br>
<a href="#" class="diagrammOn" onclick="changeClass(this,'b')" id="link_b_1">bla 2</a>
<br><br>
<a href="#" class="diagrammOff" onclick="changeClass(this,'b')" id="link_b_2">blö 2</a>
<br><br>
<a href="#" class="diagrammOff" onclick="changeClass(this,'b')" id="link_b_3">blub 2</a>
<br><br><br><br><br>
<a href="#" class="diagrammOn" onclick="changeClass(this,'c')" id="link_c_1">bla 3</a>
<br><br>
<a href="#" class="diagrammOff" onclick="changeClass(this,'c')" id="link_c_2">blö 3</a>
<br><br>
<a href="#" class="diagrammOff" onclick="changeClass(this,'c')" id="link_c_3">blub 3</a>
</body>
</html>