<select name="availability_type" id="id_availability_type" data-parsley-id="1601" data-parsley-required="true" data-parsley-required-message="You must enter at least one Detail." class="input-xlarge2 standard_input_style parsley-success">
    <option value="0"> Do not display Availability</option>
    <option value="1">Immediately</option>
    <option value="2">1 week</option>
    <option value="3">2 weeks</option>
    <option value="4">3 weeks</option>
    <option value="5">4 weeks</option>
    <option value="6">> 4 weeks</option>
</select>

<option value=" "> Do not display Availability</option>

<!--Do this-->
<select id="select-id" required="" data-parsley-required-message="You must select at least one option.">
  <option value=""> Do not display Availability</option>
  .
  .
</select>