instead using fieldset
use form
:
<form class="myFieldset">
<div id="divContainer">
<div class="anotherdiv">
<input type="text" name="testBox1" class="aclass" />
<select name="testSel1" class="atestclass">
<option value="car">car</option>
<option value="boat">boat</option>
<option value="plane">plane</option>
</select>
</input>
</div>
</div>
</form>
and test it here: fiddle