#container {
	margin:0 auto;
	width:800px;
}
header {
	height:100px;
	margin: 20px 0 0 0;
	display:block;
}
article {
	float: left;
   /* margin-right: 40px;*/
    width: 500px;
}
aside {
	float: right;
    width: 260px;
}
nav {
	display:block;
	overflow:hidden;
}
footer {
	width:800px;
	overflow: auto;
	display:block;
	padding-top: 20px;
	margin: 20px 0;
	clear:both;
}