<html>
<body>
<?PHP
$Speicher="h1";
?>
<form>
<select name="Hörstationen">
<option onClick="document.getElementById(<?=$Speicher?>).style.display='none';
document.getElementById('h1').style.display='inline';">m-station01A
<? $Speicher="h1"; ?> </option>
<option onClick="document.getElementById(<?=$Speicher?>).style.display='none';
document.getElementById('h2').style.display='inline';">m-station01H1
<? $Speicher="h2"; ?></option>
<option onClick="document.getElementById(<?=$Speicher?>).style.display='none';
document.getElementById('h3').style.display='inline';">m-station01H2
<? $Speicher="h3"; ?></option>
<option onClick="document.getElementById(<?=$Speicher?>).style.display='none';
document.getElementById('h4').style.display='inline';">m-station02A Tischtele
<? $Speicher="h4"; ?></option>
<option onClick="document.getElementById(<?=$Speicher?>).style.display='none';
document.getElementById('h5').style.display='inline';">m-station01H1 Tischtele
<? $Speicher="h5"; ?></option>
<option onClick="document.getElementById(<?=$Speicher?>).style.display='none';
document.getElementById('h6').style.display='inline';">m-station01H2 Tischstele
<? $Speicher="h6"; ?></option>
<option onClick="document.getElementById(<?=$Speicher?>).style.display='none';
document.getElementById('h7').style.display='inline';">m-station03A
<? $Speicher="h7"; ?></option>
<option onClick="document.getElementById(<?=$Speicher?>).style.display='none';
document.getElementById('h8').style.display='inline';">m-station03H1
<? $Speicher="h8"; ?></option>
<option onClick="document.getElementById(<?=$Speicher?>).style.display='none';
document.getElementById('h9').style.display='inline';">m-station03H2
<? $Speicher="h9"; ?></option>
<option onClick="document.getElementById(<?=$Speicher?>).style.display='none';
document.getElementById('h10').style.display='inline';">m-station03K1
<? $Speicher="h10"; ?></option>
<option onClick="document.getElementById(<?=$Speicher?>).style.display='none';
document.getElementById('h11').style.display='inline';">m-station03K2
<? $Speicher="h11"; ?></option>
</select>
</form>
<span id="h1" style="display:none">test 1</span>
<span id="h2" style="display:none">test 2</span>
<span id="h3" style="display:none">test 3</span>
</body>
</html>