conrad: checkbox hidden fkt. nicht

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hallo,

ich habe folgendes script:

<script type="text/javascript">
   function show(fieldname)
   {

if(document.formular.boxone.checked)
    {
     document.getElementById(fieldname).style.visibility = "hidden"; //visible
    }
    else
     document.getElementById(fieldname).style.visibility = "visible"; //hidden

if(document.formular.boxtwo.checked)
    {
     document.getElementById(fieldname).style.visibility = "hidden"; //visible
    }
    else
     document.getElementById(fieldname).style.visibility = "visible"; //hidden

if(document.formular.boxthree.checked)
    {
     document.getElementById(fieldname).style.visibility = "hidden"; //visible
    }
    else
     document.getElementById(fieldname).style.visibility = "visible"; //hidden

}

</script>
</head>

<body>
  <form name="formular" action="">
   <table border="1">
    <tr>
     <td>
      <input type="checkbox" name="boxone" onClick="void(show('fieldone'), show('transfer'));">geehrte <b>to find</b>
     </td>
     <td>
      <input type="CHECKBOX" name="fieldone" style="visibility:visible" value="Ihre Eingabe">geehrte <b>blacklist</b>
     </td>
     <td>
      <input type="CHECKBOX" name="transfer" style="visibility:visible" value="Ihre Eingabe">geehrte <b>transfer</b>
     </td>
    </tr>
    <tr>
     <td>
      <input type="checkbox" name="boxtwo" onClick="void(show('fieldone1'), show('transfer1'));">damen <b>to find</b>
     </td>
     <td>
      <input type="CHECKBOX" name="fieldone1" style="visibility:visible" value="Ihre Eingabe">damen <b>blacklist</b>
     </td>
     <td>
      <input type="CHECKBOX" name="transfer1" style="visibility:visible" value="Ihre Eingabe">damen <b>transfer</b>
     </td>
    </tr>
    <tr>
     <td>
      <input type="checkbox" name="boxthree" onClick="void(show('fieldone2'), show('transfer2'));">herren <b>to find</b>
     </td>
     <td>
      <input type="CHECKBOX" name="fieldone2" style="visibility:visible" value="Ihre Eingabe">herren <b>blacklist</b>
     </td>
     <td>
      <input type="CHECKBOX" name="transfer2" style="visibility:visible" value="Ihre Eingabe">herren <b>transfer</b>
     </td>
    </tr>
   </table>

</form>

wenn ich die letzte checkbox (herren to find) anklicke, dann verschwinden auch herren blacklist und herren transfer.

warum aber nicht unabhängig davon damen blacklist und damen transfer?

mfg

conrad