.para {clear:both; padding-bottom:10px;overflow:hidden;zoom:1}
.pt-img-left IMG {float:left; margin: 0 10px 20px 0;}
.pt-img-right IMG {float:right; margin: 0 0 0 10px;}
.pt-img-top IMG, .pt-img-bottom IMG {float:none; clear:both; display:block; margin:0 auto;}
.pt-img-top IMG {margin-bottom:20px}
.pt-img-bottom IMG {margin-top:20px}