The following code shows how to layout banner with span6.
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" type="text/css"
href="http:////netdna.bootstrapcdn.com/twitter-bootstrap/2.3.1/css/bootstrap-combined.min.css">
<script type='text/javascript'
src="http:////netdna.bootstrapcdn.com/twitter-bootstrap/2.3.1/js/bootstrap.min.js"></script>
<style type='text/css'>
#main {<!--from w w w.j av a 2 s . co m-->
background-color: #aaa;
}
p, h2 {
padding-left: 10px;
}
</style>
</head>
<body>
<div id="main" class="container" role="main">
<div class="row">
<div class="span6">
<h2>Welcome</h2>
<p>Hello and welcome to my website.</p>
</div>
<div class="span6"><img src='http://placehold.it/600x100'/></div>
</div>
</div>
</body>
</html>