body{
	margin: 0 auto;
	width: 960px;

}

nav{
	width: 960px;
	height: 50px;
	background: #f3f3f3;
	border: 1px solid #cccccc;
}

nav ul{
	margin: 0 auto;
	width: 500px;
	list-style: none;

}

nav ul li{
	float:left;
}

nav ul li a{
	display: block;
	margin-right: 10px;
	width: 100px;
	font-size: 18px;
	line-height: 44px;
	text-align: center;
	text-decoration: none;
	color: #000;

}

#content{
	clear:both;
}

#mcontent{
	float:left;
	width: 620px;
}

aside{
	float:left;
	width: 300px;
}

footer{
	clear:both;
}