/* main_img */
.main_img{
 
	overflow:hidden;
	position: relative; float:left;
}
.main_img img{
 
    overflow-x: hidden;
    overflow-y: hidden;
    position: relative;
	z-index:1;
	transition-delay: 0s;
    transition-duration: 1s;
    transition-property: all;
    transition-timing-function: ease;
	/* Firefox 4 */
	-moz-transition-delay: 0s;
    -moz-transition-duration: 1s;
    -moz-transition-property: all;
    -moz-transition-timing-function: ease;
	/* Safari 和 Chrome */
	-webkit-transition-delay: 0s;
    -webkit-transition-duration: 1s;
    -webkit-transition-property: all;
    -webkit-transition-timing-function: ease;
	/* Opera */
	-o-transition-delay: 0s;
    -o-transition-duration: 1s;
    -o-transition-property: all;
    -o-transition-timing-function: ease;
	} 
.main_img:hover img {
	transform: scale(1.2, 1.2);
	
	-ms-transform:scale(1.2, 1.2); 	/* IE 9 */
	-moz-transform:scale(1.2, 1.2); 	/* Firefox */
	-webkit-transform:scale(1.2, 1.2); /* Safari 和 Chrome */
	-o-transform:scale(1.2, 1.2); 	/* Opera */
}