 icon-spin"></i> Loading...</button>
  </div>
  <h4>Bootstrap Prepend and Append</h4>
  <div class="row">
    <div class="span6">
      <div class="input-prepend">
        <span class="add-on"><i class="icon-spinner icon-spin"></i></span>
        <input class="span2" id="prependedInput" type="text" placeholder="Username">
      </div>
    </div>
    <div class="span6">
      <div class="input-append">
        <input class="span2" id="appendedInput" type="text">
        <span class="add-on"><i class="icon-sp