<label for="showtimes">Showtimes</label>
<select id="showtimes" name="showtimes">
<optgroup label="1PM"></optgroup>
<option value="titanic">Twister</option>
<option value="nd">Napoleon Dynamite</option>
<option value="wab">What About Bob?</option>
<optgroup label="2PM"></optgroup>
<option value="bkrw">Be Kind Rewind</option>
<option value="stf">Stranger Than Fiction</option>
</select>
<!-- The <optgroup> tag is a great way to add a little definition between groups of options inside a select box. If you needed to group movie listings by time -->