How can I put a button related to the other?
Example:
<span class="IWLABEL10CSS" id="IWLABEL7">Distrito</span>
<select name="PAIS" size="1" width="180" class="COMBODISTCSS" id="COMBOFAB" tabindex="1">
<option value="Indiferente">Indiferente</option>
<option value="Portugal">PORTUGAL</option>
<option value="Brasil">BRASIL</option>
<option value="Espanha">ESPANHA</option>
</select>
and then I have another option that is the Counties.
<span class="IWLABEL7CSS" id="IWLABEL7">Concelho</span>
<select name="CIDADE" size="1" width="195" class="COMBOCONCCSS" id="COMBOFAB" tabindex="1">
<option value="Indiferente">Indiferente</option>
<option value="Lisboa">Lisboa</option>
<option value="Porto">Porto</option>
<option value="Madrid">Madrid</option>
<option value="Barcelona">Barcelona</option>
<option value="Brasilia">Brasilia</option>
<option value="São Paulo">São Paulo</option>
I choose SPAIN in the first country option and I want it to appear only in the cities BARCELONA, MADRID, etc.