Как да направя това ( 3 дива) ?

HTML:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
	<title> Добре дошли!</title>
	<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
	<style>
		#content{
			width:600px;
			margin:0 auto;
		}
		#header{
			height:100px;
			background:#000;
			color:#fff;
			text-align:center;
		}
		#left{
			width:210px;
			float:left;
		}
		#center{
			width:200px;
			float:left;
		}
		#right{
			width:180px;
			padding-bottom:10px;
			float:right;
		}
		#footer{
			padding:20px;
			clear:both;
			background:#000;
			color:#fff;
		}
		.aside{
			padding:0;
			width:180px;
			background:#c3c3c3;
			-moz-border-radius:5px;
		}
		.title{
			text-align:center;
			background:#ff0000;
			font:normal 12px Tahoma;
			-moz-border-radius:5px 5px 0px 0px;
		}
	</style>
</head>
	<body>
		<div id="content">
			<div id="header">

				HEADER
			</div>
			<div id="left">
				<div class="aside">
					<h2 class="title">Заглавие</h2>
					Lorem ipsuim
				</div>
			</div>
			<div id="center">

				<div class="aside">
					<h2 class="title">Заглавие</h2>
					Lorem ipsuim
				</div>
			</div>
			<div id="right">
				<div class="aside">
					<h2 class="title">Заглавие</h2>

					Lorem ipsuim
				</div>
			</div>
			<div id="footer">
				Copyright ©
			</div>
		</div>
	</body>
</html>
 

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