Thorsten F.: Typ des Formularfelds ändern

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in etwa so?

getestet und für gut befunden!

<html>
<head>

<script type="text/javascript">

function show()
{
   if(document.getElementById)
     document.getElementById("vor").style.visibility = "visible";
}

</script>
</head>

<body>
<form name="Formular" method="POST">
   <table border=0 align="center">
      <tr>
        <td ID="nach" class=heading bgcolor=ccccc align="center">
            Ihr Nachname
        </td>
        <td align="center">
            <input type="text" onkeydown="show();" name="nachname"/ >
        </td>
     </tr>
     <tr>
       <td class=heading bgcolor=ccccc align="center">
           Ihr Vorname
       </td>
       <td ID="vor" style="visibility:hidden" align="center">
           <input type="text"  name="vorname"/ >
       </td>
     </tr>
   </table>
</form>
</body>
</html>