The following code shows how to create affix container.
<!DOCTYPE html>
<html>
<head>
<script type='text/javascript'
src='http://code.jquery.com/jquery-1.8.3.js'></script>
<script type='text/javascript'
src="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.1.0/js/bootstrap.min.js"></script>
<link rel="stylesheet" type="text/css"
href="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.1.0/css/bootstrap.min.css">
<style type='text/css'>
#con .well {<!--from w ww . j av a 2 s.c om-->
height: 400px;
}
#nav.affix {
position: fixed;
top: 0;
width: 100%
}
</style>
</head>
<body style='margin:30px'>
<div class="container" id="con">
<div class="row">
<div class="span12">
<div class="well">
<h1>Header</h1>
</div>
</div>
</div>
</div>
<div class="container" data-spy="affix" data-offset-top="400" id="nav">
<div class="navbar">
<div class="navbar-inner">
<div class="container">
<div class="span12">
<a class="brand" href="#">Home</a>
<ul class="nav">
<li class="active"><a href="#">Home</a></li>
<li><a href="#">Link</a></li>
<li><a href="#">Link</a></li>
</ul>
</div>
</div>
</div>
</div>
</div>
<div class="container">
<div class="span3">
<p style="height: 1000px; padding: 10px;">Long scrolling text
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</div>
</div>
</body>
</html>