<script src="http://ajax.aspnetcdn.com/ajax/jquery.ui/1.10.0/jquery-ui.js"></script>
<link rel="stylesheet" href="http://ajax.aspnetcdn.com/ajax/jquery.ui/1.10.0/themes/black-tie/jquery-ui.css">
<p><a href="#" title="<span class='red'>This is a <a href='#'>link</a></sp an>">Tooltips</a> can be attached to any element. When you hover the element with your mouse, the title attribute is displayed in a little box next to the element, just like a native tooltip.</p>