<select name="auto">
<optgroup label="Italiane">
<option>Alfa Romeo</option>
<option>Fiat</option>
</optgroup>

<optgroup label="Americane">
<option>Ford</option>
<option>General Motor</option>
</optgroup>
<optgroup label="Tedesche">
<option>Mercedes</option>
<option>Volkswagen</option>
</optgroup>
</select>


provare x credere