#adleft,
    #adright {
      width: 150px;
      height: 250px;
      font: 14px/20px arial;
      text-align: center;
      position: absolute;
      cursor: pointer;
      z-index: 999;
    }

    #adleft {
        left: 15px;
      top: 750px;
    }

    #adright {
        right: 15px;
        top:750px;
    }