#download{width:1280px;height:121px;position:absolute;top:880px;left:50%;margin-left:-570px;z-index:1500;}

/*下载*/
#downloada{float:left;width:1280px;height:121px;overflow:hidden;margin-right:20px;margin-top:10px}

#downloada .btn_downa{float:left;width:340px;height:121px;;position:relative;text-indent:-9999em;background:url(btn-1.png) no-repeat left bottom;display:block;}
#downloada .btn_downa:hover{text-decoration:none;;background:url(btn-1_hover.png) no-repeat left top;}
#downloada .btn_downb{float:left;width:340px;height:121px;position:relative;text-indent:-9999em;background:url(btn-2.png) no-repeat left bottom;display:block;margin-left:60px;}
#downloada .btn_downb:hover{text-decoration:none;background:url(btn-2_hover.png) no-repeat left top;}
#downloada .btn_downc{float:left;width:340px;height:121px;position:relative;text-indent:-9999em;background:url(btn-3.png) no-repeat left bottom;display:block;margin-left:60px;}
#downloada .btn_downc:hover{text-decoration:none;background:url(btn-3_hover.png) no-repeat left top;}