salve ragazzi buongiorno
questa sotto e la mia pagina del form. vorrei che quando il menu a tendina di CATEGORIA vada su Affitto mi esca subito un altro campo da inserire ma questo deve essere fatto solo quando la categoria e uguale a affitto come farE?? aiuto
<table border="0" bgcolor="DCDCDC">
<tr><td style="width: 120px; height: 25px; padding: 1px; ">PostoBarca Presso</td><td></td><td><input type="text" Name="tit" required></td></tr>
<tr><td style="width: 100px; height: 25px; padding: 1px; overflow: auto;">Lunghezza mt</td><td></td><td><input type="text" Name="lun" size="6" required></td></tr>
<tr><td style="width: 100px; height: 25px; padding: 1px; overflow: auto;">Larghezza mt</td><td></td><td><input type="text" Name="lar" size="6" required>
<tr><td style="width: 100px; height: 25px; padding: 1px; overflow: auto;">Categoria</td><td></td><td><select name="cat" required>
<option value="Tutto">Tutto</option>
<option value="Affitto">Affitto</option>
<option value="Transito">Transito</option>
<option value="Vendita">Vendita</option>
</td></tr>
<tr><td style="width: 100px; height: 25px; padding: 1px; overflow: auto;">Tipologia</td><td></td><td><select name="tip" required>
<option value="Tutto">Tutto</option>
<option value="Affitto cerco">Affitto Cerco</option>
<option value="Affitto offro">Affitto Offro</option>
<option value="Cedo vendo">Cedo vendo</option>
<option value="Compro">Compro</option>
<option value="Scambio cerco">Scambio cerco</option>
<option value="Scambio offro">Scambio offro</option>
</td></tr>
<tr>
<td style="width: 10px; height: 25px; padding: 1px; overflow: auto;">Data Scadenza
</td><td align="right"><select name="sca" required>
<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>
<td><select name="mese" required>
<option value="01">Gennaio</option>
<option value="02">Febbraio</option>
<option value="03">Marzo</option>
<option value="04">Aprile</option>
<option value="05">Maggio</option>
<option value="06">Giugno</option>
<option value="07">Luglio</option>
<option value="08">Agosto</option>
<option value="09">Settembre</option>
<option value="10">Ottobre</option>
<option value="11">Novembre</option>
<option value="12">Dicembre</option></select>
<input type="text" Name="anno" value="20" size="4" maxlength="4">
</td>
</tr>
<tr><td>Vela/motore</td><td></td><td><select name="velmot">
<option value="Vela/Motore">Vela/Motore</option>
<option value="Vela">Vela</option>
<option value="Motore">Motore</option>
</select>
</td></tr>
<tr><td style="width: 100px; height: 25px; padding: 1px; overflow: auto;">Prezzo</td><td></td><td><input type="text" Name="prz" size="10" required></tr>
<tr><td></td><td></td><td><input name="submit" type="submit" Value="Pubblica"></td></tr>
</table>
</table>
</body>
</form>
</form>
</table>
</Center>
</body>
</html>