Codice PHP:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd"
>
<
html>
<
head>
<
meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<
title>Documento senza titolo</title>
<
script language="javascript" type="text/javascript">
function 
copia()
{
    
document.getElementById('output').value document.getElementById('input').value;
}
</script>
</head>

<body>
<form name="form1" method="post" action="">
  


    <input name="input" type="text" id="input">
</p>
  


    <textarea name="output" id="output"></textarea>
</p>
  


    <input type="button" name="Submit" value="Inserisci" onClick="copia()">
  </p>
</form>
</body>
</html>