/*公告*/
#download {
	width: 1680px;
	height: 300px;
	position: absolute;
	top: 840px;
	left: 50%;
	margin-left: -420px;
	z-index: 1500;
}

/*下载*/
#downloada {
	float: left;
	width: 1680px;
	height: 300px;
	overflow: hidden;
	margin-right: 20px;
	margin-top: 10px;
}

#downloada .btn_downa {
	float: left;
	width: 150px;
	height: 215px;
	position: relative;
	text-indent: -9999em;
	background: url(../images/a1.png) no-repeat left bottom;
	display: block;
}
#downloada .btn_downa:hover {
	text-decoration: none;
	background: url(../images/a1.png) no-repeat left top;
}
#downloada .btn_downb {
	float: left;
	width: 150px;
	height: 215px;
	position: relative;
	text-indent: -9999em;
	background: url(../images/b1.png) no-repeat left bottom;
	display: block;
	margin-left: 80px;
}
#downloada .btn_downb:hover {
	text-decoration: none;
	background: url(../images/b1.png) no-repeat left top;
}
#downloada .btn_downc {
	float: left;
	width: 150px;
	height: 215px;
	position: relative;
	text-indent: -9999em;
	background: url(../images/c1.png) no-repeat left bottom;
	display: block;
	margin-left: 80px;
}
#downloada .btn_downc:hover {
	text-decoration: none;
	background: url(../images/c1.png) no-repeat left top;
}
#downloada .btn_downd {
	float: left;
	width: 150px;
	height: 215px;
	position: relative;
	text-indent: -9999em;
	background: url(../images/d1.png) no-repeat left bottom;
	display: block;
	margin-left: 80px;
}
#downloada .btn_downd:hover {
	text-decoration: none;
	background: url(../images/d1.png) no-repeat left top;
}