.pro_size {
	font-size: 0;
	margin: 0px auto;
	padding: 0;
	list-style-type: none;
	display: block;
	width: 100%;
	border: 1px solid #ddd;
	border-radius: 4px;
	background-color:#fff;
	position: relative;
	clear:both;
	margin-bottom:10px;
	/*overflow:hidden;*/
}
.pro_size div.dummy {
	padding-top: 100%;/*改变图片的高度*/
}
.pro_size img{
	position: absolute;
	top: 0;
	bottom: 0;
	left: 0;
	right: 0;
	max-width: 96%;
	max-height: 96%;
	display: block;
	margin: auto;
	padding: auto;
	border: 0px solid blue;	
	border-radius: 0px;
}