[рони]

Beactive,

<style type="text/css">
   .popular-category :checked ~ ul {
  display: block;
}

.popular-category ul {
  display: none;
}

  </style>
<li id="vehicle_models-29" class="popular-category">
  <input value="29" type="checkbox" name="tax_input[vehicle_models][]" id="in-vehicle_models-29" class="">
  <label for="in-vehicle_models-29" class="selectit">Alfa Romeo</label>
  <ul class="children">

    <li id="vehicle_models-173" class="">
      <label class="selectit">
        <input value="173" type="radio" name="tax_input[vehicle_models][]" id="in-vehicle_models-173" class=""> 145</label>
    </li>

    <li id="vehicle_models-174" class="">
      <label class="selectit">
        <input value="174" type="radio" name="tax_input[vehicle_models][]" id="in-vehicle_models-174" class=""> 146</label>
    </li>

    <li id="vehicle_models-175" class="">
      <label class="selectit">
        <input value="175" type="radio" name="tax_input[vehicle_models][]" id="in-vehicle_models-175" class=""> 147</label>
    </li>

    <li id="vehicle_models-176" class="">
      <label class="selectit">
        <input value="176" type="radio" name="tax_input[vehicle_models][]" id="in-vehicle_models-176" class=""> 155</label>
    </li>

    <li id="vehicle_models-177" class="">
      <label class="selectit">
        <input value="177" type="radio" name="tax_input[vehicle_models][]" id="in-vehicle_models-177" class=""> 156</label>
    </li>

    <li id="vehicle_models-178" class="">
      <label class="selectit">
        <input value="178" type="radio" name="tax_input[vehicle_models][]" id="in-vehicle_models-178" class=""> 159</label>
    </li>

    <li id="vehicle_models-179" class="">
      <label class="selectit">
        <input value="179" type="radio" name="tax_input[vehicle_models][]" id="in-vehicle_models-179" class=""> 164</label>
    </li>

    <li id="vehicle_models-180" class="">
      <label class="selectit">
        <input value="180" type="radio" name="tax_input[vehicle_models][]" id="in-vehicle_models-180" class=""> 166</label>
    </li>

    <li id="vehicle_models-181" class="">
      <label class="selectit">
        <input value="181" type="radio" name="tax_input[vehicle_models][]" id="in-vehicle_models-181" class=""> 33</label>
    </li>

    <li id="vehicle_models-182" class="">
      <label class="selectit">
        <input value="182" type="radio" name="tax_input[vehicle_models][]" id="in-vehicle_models-182" class=""> 75</label>
    </li>

    <li id="vehicle_models-183" class="">
      <label class="selectit">
        <input value="183" type="radio" name="tax_input[vehicle_models][]" id="in-vehicle_models-183" class=""> 90</label>
    </li>

    <li id="vehicle_models-184" class="">
      <label class="selectit">
        <input value="184" type="radio" name="tax_input[vehicle_models][]" id="in-vehicle_models-184" class=""> Alfasud</label>
    </li>

    <li id="vehicle_models-185" class="">
      <label class="selectit">
        <input value="185" type="radio" name="tax_input[vehicle_models][]" id="in-vehicle_models-185" class=""> Alfetta</label>
    </li>

    <li id="vehicle_models-186" class="">
      <label class="selectit">
        <input value="186" type="radio" name="tax_input[vehicle_models][]" id="in-vehicle_models-186" class=""> Arna</label>
    </li>

    <li id="vehicle_models-187" class="">
      <label class="selectit">
        <input value="187" type="radio" name="tax_input[vehicle_models][]" id="in-vehicle_models-187" class=""> Brera</label>
    </li>

    <li id="vehicle_models-188" class="">
      <label class="selectit">
        <input value="188" type="radio" name="tax_input[vehicle_models][]" id="in-vehicle_models-188" class=""> GT</label>
    </li>

    <li id="vehicle_models-189" class="">
      <label class="selectit">
        <input value="189" type="radio" name="tax_input[vehicle_models][]" id="in-vehicle_models-189" class=""> GTV</label>
    </li>

    <li id="vehicle_models-190" class="">
      <label class="selectit">
        <input value="190" type="radio" name="tax_input[vehicle_models][]" id="in-vehicle_models-190" class=""> Guilietta</label>
    </li>

    <li id="vehicle_models-191" class="">
      <label class="selectit">
        <input value="191" type="radio" name="tax_input[vehicle_models][]" id="in-vehicle_models-191" class=""> MiTo</label>
    </li>

    <li id="vehicle_models-192" class="">
      <label class="selectit">
        <input value="192" type="radio" name="tax_input[vehicle_models][]" id="in-vehicle_models-192" class=""> Montreal</label>
    </li>

    <li id="vehicle_models-193" class="">
      <label class="selectit">
        <input value="193" type="radio" name="tax_input[vehicle_models][]" id="in-vehicle_models-193" class=""> Spider</label>
    </li>
  </ul>
</li>