header, nav, footer, article, aside {display:block;}

<!--[if IE]>
 <script src=
 "http://html5shiv.googlecode.com/svn/trunk/html5.js">
 </script>
<![endif]--> 

nav {float:left; width:20%;}
header {float:left; width:80%;}
article {float:left; width:80%;}
footer {float:left; width:80%;}
aside {float:right; width:19%; margin-top:1cm;}

footer p, h3
	{
		text-align: center; 
	}
	
header p, h1, h2, h3
	{
		text-align: center; 
	}
	
article h1, h2, h3
	{
		text-align: center; 
	}
	
article td
	{
		text-align: left;
	}