come mai questo script inserito in un livello non funziona???

<script language="javascript" src="cf.js"></script>
<form name="CodiceFiscale">
<table border=0>
<tr><td width="200">Cognome:</td><td width="218"><input type="text" name="iCognome" value=""></td></tr>
<tr><td>Nome:</td>
<td><input type="text" name="iNome" value=""></td>
</tr>
<tr>
<td>Data di nascita (gg/mm/aaaa):</td>
<td>
<select name="iGiorno">
<option value="01">01</option>
<option value="02">02</option>
<option value="03">03</option>
<option value="04">04</option>
<option value="05">05</option>
<option value="06">06</option>
<option value="07">07</option>
<option value="08">08</option>
<option value="09">09</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>
<option value="21">21</option>
<option value="22">22</option>
<option value="23">23</option>
<option value="24">24</option>
<option value="25">25</option>
<option value="26">26</option>
<option value="27">27</option>
<option value="28">28</option>
<option value="29">29</option>
<option value="30">30</option>
<option value="31">31</option>
</select>
<select name="iMese">
<option value="A">1</option>
<option value="B">2</option>
<option value="C">3</option>
<option value="D">4</option>
<option value="E">5</option>
<option value="H">6</option>
<option value="L">7</option>
<option value="M">8</option>
<option value="P">9</option>
<option value="R">10</option>
<option value="S">11</option>
<option value="T">12</option>
</select>
<input type="text" name="iAnno" size=5 maxlength=4>
</td>
</tr>
<tr><td>Sesso</td><td><select name="iGender"><option value="M">M</option><option value="F">F</option></select></td></tr>
<tr>
<td>Comune di nascita:</td>
<td><input type="text" name="iComune"></td></tr>
<tr><td align=right><input type="button" value="Calcola" onClick="CalcolaCodiceFiscale()"></td><td><textarea name="Risultato"></textarea></td></tr>
</table>
</form>

c'è un modo???

ps non mi funziona nemmeno inserito in una pop up...