[Vlasenko Fedor]

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.js"></script>
<select id="select1">
  <option>1</option>
  <option>2</option>
</select>
<div id="form"></div>
<script>
  $(function () {
    $('#select1').on("change", function () {
      $('#form').append('<input type="button" class="post_btn" value="Добавить Пост">');
    });
    $('#form').on("click", "input.post_btn", function () {
      alert('есть!')
    });
  });
</script>