specifying images in twitter bootstrap

[cobby]

I am trying to experiment with the twitter-bootstrap examplehttp://twitter.github.io/bootstrap/examples/carousel.htmlIf you go to the page, you will see there are three light circles with 140X140 written in it.I am trying to have an image in that circle.. The following is the relevant code\[code\]<div class="span4"> <img class="img-circle" data-src="http://stackoverflow.com/questions/15855666/holder.js/140x140"> <h2>foobar</h2> <p>Elaborate</p> <p><a class="btn" href="http://stackoverflow.com/questions/15855666/#">View details &raquo;</a></p> </div><!-- /.span4 -->\[/code\]How can i achieve that?Thanks.