<form>
<th>
<label for = "Games">Games</label>
<tr>
<td>
<select id = "games">
<option value = "">Select game</option>
<optgroup label = "RPG">RPG
<option value = "KOTOR">KOTOR</option>
<option value="KOTOR2">KOTOR2</option>
<option value = "Diablo3">Diablo3</option>
</optgroup>
<optgroup label = "stealth">Stealth
<option value = "Splinter cell">Splinter cell</option>
<option value = "Hitman" >Hitman</option>>
</optgroup>
</select>
</td>
</tr>
</th>
</form>