#Download{width: 764px;height: 172px;text-align:center;position:absolute;top: 900px;left:50%;margin-left: -370px;z-index:5100;border-radius:5px;background: url("../images/down.png") no-repeat left top;}
#Download .btn_down_s1{float:left;width: 240px;height: 87px;text-indent:-999em;margin-left: 107px;margin-top: 43px;}
#Download .btn_down_s2{float:left;width: 99px;height: 91px;text-indent:-999em;margin-left: -10px;margin-top: 39px;}
#Download .btn_down_s3{float:left;width: 99px;height: 101px;text-indent:-999em;margin-left: 4px;margin-top: 35px;}
#Download .btn_down_s4{float:left;width: 99px;height: 89px;text-indent:-999em;margin-left: 4px;margin-top: 42px;}