/* wrap */
.wrap{margin:50px auto;width:1600px;height:437px;position:relative;overflow:hidden;}
.pic{width:1600px;height:437px;cursor:pointer;}
.pic1{background:url('../image/shoufen1.jpg') no-repeat;position:absolute;top:0;left:0;z-index:1;}

.pic2{background:url('../image/shoufen2.jpg') no-repeat;position:absolute;top:0;left:679px;z-index:3;}

.pic3{background:url('../image/shoufen3.jpg') no-repeat;position:absolute;top:0;left:770px;z-index:5;}
 
.pic4{background:url('../image/shoufen4.jpg') no-repeat;position:absolute;top:0;left:861px;z-index:7;}