1:
2:
3:
4:
5:
6:

<select name="squad" id="squad">
      <option>Alpha</option>
      <option>Bravo</option>
      <option>Charlie</option>
      <option>Delta</option>
</select>

1:
2:

<div id="layer1">Hallo Welt</div>
<div id="layer2" style="visibility: hidden">Hallo LX</div>

1:
2:
3:
4:

<select name="auswahl" onchange="changeDiv(this.selectedIndex)">
<option>Hallo Welt</option>
<option>Hallo LX</option>
</select>

1:
2:
3:
4:
5:
6:
7:
8:
9:

<script type="text/javascript">
var numlayers = 2;  // Anzahl der Layer

function changeDiv(id)
{
  for (i = 1; i <= numlayers; i++) document.getElementById('layer'+i).style.visibility = 'hidden';
  document.getElementById('layer'+id).style.visibility = 'visible';
}
</script>