Here is basic example of using jquery-tools tooltips
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title> - jsFiddle demo</title>
<script type='text/javascript' src="http://cdn.jquerytools.org/1.2.7/full/jquery.tools.min.js"></script>
<style type='text/css'>
.form {
margin: 50px;
}
.tooltip {
display:none;
background:gray;
font-size:12px;
height:30px;
width:100px;
padding:5px;
color:#eee;
}
</style>
<script type='text/javascript'>//<![CDATA[
$(document).ready(function(){
$('form input[type="radio"]').tooltip();
});
//]]>
</script>
</head>
<body>
<form name="form1" method="post" class="form" action="">
<input type="radio" name="radio" id="jqt1" value="jqt1" title="Tooltip text 1"><label for="jqt1">label 1</label><br>
<input type="radio" name="radio" id="jqt2" value="jqt2" title="Tooltip text 2"><label for="jqt2">label 2</label><br>
<input type="radio" name="radio" id="jqt3" value="jqt3" title="Tooltip text 3"><label for="jqt3">label 3</label><br>
</form>
</body>
</html>
In your fiddles link to jquery tools was broken.