.quansi{ margin:0 auto; width:950px}
.indeximg a{ float:left}
.indeximg1{	width:237px;height:57px;background: url(http://www.5656i.com/themes/images/xiadan1.gif); no-repeat;}
.indeximg1:hover{background: url(http://www.5656i.com/themes/images/xiadan2.jpg); no-repeat;}

.indeximg2{	width:237px;height:57px;background: url(http://www.5656i.com/themes/images/jiameng1.jpg); no-repeat;}
.indeximg2:hover{background: url(http://www.5656i.com/themes/images/jiameng2.jpg); no-repeat;}

.indeximg3{	width:237px;height:57px;background: url(http://www.5656i.com/themes/images/hexin1.jpg); no-repeat;}
.indeximg3:hover{background: url(http://www.5656i.com/themes/images/hexin2.jpg); no-repeat;}

.indeximg4{	width:237px;height:57px;background: url(http://www.5656i.com/themes/images/shiti1.jpg); no-repeat;}
.indeximg4:hover{background: url(http://www.5656i.com/themes/images/shiti2.jpg); no-repeat;}