The following code shows how to add tooltip to flag icon.
<!DOCTYPE html>
<html>
<head>
<script type='text/javascript'
src='http://code.jquery.com/jquery-git.js'></script>
<link rel="stylesheet" type="text/css"
href="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.3.2/css/bootstrap-combined.min.css">
<script type='text/javascript'
src="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.3.2/js/bootstrap.min.js"></script>
<script type='text/javascript'>//<![CDATA[
$(function(){<!-- w ww . j a v a2s . c o m-->
$('[rel=tooltip]').tooltip({
placement: 'bottom'
});
});//]]>
</script>
</head>
<body>
<a id="flag"> <i class="icon-flag" data-toggle="tooltip"
rel="tooltip" title="Flag"></i>
</a>
</body>
</html>