<select id="butter_test" name="butter_test" onchange="if (this.selectedIndex + 1 == this.options.length) { fb_other_on('_other_butter_test') } else { fb_other_off('_other_butter_test') }">
  <option value="">-select-</option>
  <option value="1">1</option>
  <option value="2">2</option>
  <option value="3">3</option>
  <option value="4">4</option>
  <option value="5">5</option>
  <option value="_other_butter_test">Other:</option>
  </select> <input disabled="disabled" id="_other_butter_test" name="_other_butter_test" type="text" />