Untitled

<html>
<head>
<style>
	#container {
		width:100%;
	}
	#left {
		float:left;
		background-color:red;
		height:300px;
		width:200px;
	}
	#right {
		float:right;
		background-color:blue;
		width:300px;
		height:500px;
	}
</style>
</head>
<body>
<div id='container'>
	<div id='left'>left</div>
	<div id='right'>right</div>
</div>
</body>
</html>