The following code shows how to create a row with span4 span4 span4.
<!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/2.3.0/js/bootstrap.min.js"></script>
<link rel="stylesheet" type="text/css"
href="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.3.0/css/bootstrap-combined.min.css">
<style type='text/css'>
.span4 {<!-- w ww.ja v a2 s . co m-->
background-color: olive;
}
.span12 {
border: solid 2px black;
}
</style>
</head>
<body>
<div class="container">
<div class="row">
<div class="span12">
<div class="row">
<div class="span4">1</div>
<div class="span4">2</div>
<div class="span4">3</div>
</div>
<!-- end nested row -->
</div>
<!-- end span 12 -->
</div>
<!-- end row -->
</div>
<!-- end container -->
</body>
</html>