#ref{
	width:300px;
	margin:20px auto;}
  #gallery { position: relative; z-index:1000; }
    #pictures { position: relative; height: 180px; }
    #pictures img { position: absolute; top: 0; left: 0; }
      #prev, #next { margin-top: 30px; text-align: center; font-size: 14px; }