The following code shows how to create row with span4 and span8.
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" type="text/css"
href="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.2.2/css/bootstrap-combined.min.css">
</head><!--from ww w . j a va 2 s .c o m-->
<body>
<div class='container'>
<div class='row'>
<div class='span4'>a</div>
<div class='span8'>b</div>
</div>
</div>
</body>
</html>