ciao a tutti,

ho una select e un pulsante dentro un form

cosi
codice:
<html>
<head>
<title>TEST</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</head>

<body>
<form name="form1" method="get" action="">
  <select name="nfoto" id="nfoto">
    <option value="1">1</option>
    <option value="2">2</option>
    <option value="3">3</option>
    <option value="4">4</option>
    <option value="5">5</option>
    <option value="6">6</option>
    <option value="7">7</option>
    <option value="8">8</option>
    <option value="9">9</option>
    <option value="10">10</option>
    <option value="11">11</option>
    <option value="12">12</option>
    <option value="13">13</option>
    <option value="14">14</option>
    <option value="15">15</option>
    <option value="16">16</option>
    <option value="17">17</option>
    <option value="18">18</option>
    <option value="19">19</option>
    <option value="20">20</option>
  </select>
  <input type="submit" name="Submit" value="Invia">
</form>
</body>
</html>
come posso fare in modo che alla pressione del tasto mi si creano tanti campi file in base alla selezione della selct?

Grazie mille