.xn_commons_professor_channel_header{
	width:100%;
	z-index:1000;
	padding:0px;
	margin:0px;
	left:0px;
	top:0px;
	height: 100px;
	position:fixed;
	clear: both;
}

#xn_commons_professor_channel{
	width: 100%;
	float: left;
	position: absolute;
	bottom: 30px;
	top: 100px;
	overflow: auto;
}

#xn_commons_professor_channel .content_wapper{

	width: 980px;
	margin:0 auto;
	overflow: auto;	
}

.xn_commons_professor_channel_bottom{
	width: 100%;
	float: left;
	text-align: center;
	color: #9a9a9a;
	background: #2d2d2d;
	border-top: 1px solid #000;
	padding: 10px 0px;
	font-size: 11px;
	position: absolute;
	bottom: 0px;
	z-index:1000;
	height: 10px;
}