<script src="https://code.jquery.com/jquery-3.1.0.js"></script><form method="post" class="ms2_form msoptionsprice-product list-tov">

     <div class="number">

  <span class="minus">-</span>

  <input name="count" value="1" max-legth="4" class="input-sm form-control" type="number" id="product_count"/>

  <span class="plus">+</span>

</div>

<button class="btn btn-default button" type="submit" name="ms2_action" value="cart/add">  [[%ms2_frontend_add_to_cart]]</button>

<input type="hidden" name="id" value="[[+id]]"> 

</div>

</form>

</div>